My gdal 3.4.1 doesn't get the extent.
I answered this (badly) on gis.stackexchange - its a 10degree tile where
the origin is related to the h and v elements of the path (and also stored
as attributes in the netcdf structure).
I think I messed up the vertical offset, which was because I only bothe
Are you asking if there's a way to automate the download of a list of links
from that page? You could write an R script to get the HTML, then find all
the HTML tags, and then get the URLs in the link addresses, and there's
packages for doing this kind of web scraping.
But for this kind of thing i
As I said on gis.stackoverflow, these two things are probably in the
same CRS anyway.
But also some people have replied suggesting you transform the raster.
DONT! (Unless you really have to...). If your raster had been
something like 0.5 degree lat-long cells, then transforming it EPSG
27700 (GB g
Lines('countrymasks.geojson') |> st_read() -> r
>
> with a warning:
>
> Warning message:
> In readLines("countrymasks.geojson") :
> incomplete final line found on 'countrymasks.geojson'
>
>
> On 29/11/2022 00:58, Miluji Sb wrote:
>
This seems to be a weird bug in `st_read`. If you read it with an SQL
query that matches every row it works:
> js = st_read("./countrymasks.geojson", query="select * from countrymasks
> where 1 = 1")
Reading query `select * from countrymasks where 1 = 1' from data
source `/home/rowlings/Downloads
Before messing with lgcp I'd look at spatstat - lgcp is more intended for
relative risk calculations where you have "cases" and "controls", and also
for
space-time data.
spatstat seems to have functions for fitting (and simulating) LGCPs to
point patterns so I think that might be what you are afte
Eugene,
I don't think this can be done using the PROJ library that does most
coordinate transformations for sf objects. The `astrolibR` package has
functions for converting coordinates on various astronomical systems
https://cran.r-project.org/web/packages/astrolibR/astrolibR.pdf
but you have t
Hope nobody thinks I'm spamming the list but I'd like to promote the
conference that we are holding in April in honour of Prof Diggle's 70th
birthday (actually yesterday).
I've worked with him for nearly 30 years, and I wrote the first version of
`splancs` for `S` by interfacing to his Fortran cod
On Wed, Nov 6, 2019 at 6:18 AM Bede-Fazekas Ákos
wrote:
> Dear Cristabel,
> function focal() of package raster is what you are searching for.
>
No it isn't. That operates over the whole raster, which is massive overkill
for querying the eight pixels around a single point.
>
> > var <- nc[lon.c
Can you manipulate the adjacency list structure to add `i` to each list
element vector?
eg using sample data from spdep:
make a neighbour structure:
> colnn = poly2nb(columbus)
this is a list - so for example polygon 4 is next to:
> colnn[[4]]
[1] 2 3 5 8
2, 3, 5, and 8. It seems you want
Buffering the data by a teeny tiny number of fractional degrees is
sufficient to make the edges overlap enough to dissolve properly. Hacky
solution, and results in a world that is 0.1 degrees more coastline all
round (a negative buffer can correct for this a bit).
kk <- aggregate(st_buffer(wor
ects as geometry
sdf = st_set_geometry(df, newGeom)
3. (optional) drop the character format column
sdf$geom=NULL
Now you've got a standard `sf` spatial data frame with the converted
geometry. If any of that is wrong I'm sure the real experts here will
correct me.
Barry
On Tue, Oct 15, 20
These strings are hexadecimal WKB geometries. You should be able to turn
them back into geometries:
> s =
"010520D7080100010200039875DF60AC2D4100606296BDAC07410037DB98F1AC2D41001C5EFC79AA074180A23112E1AA2D41001E0E5F18A20741"
by constructing a WKB object:
> wkb = structur
if I want to add three areas to an area – say I want to add 6,7 and 8
> to the area 10??
>
> Please may I have the syntax for that to avoid the integer error??
>
> Is this also the root of the error about not being the correct index??
>
> Many thanks again,
>
> Stuart
I recently answered a similar question on Stack Overflow where someone
needed to add detached polygons to their connected network by connecting
them to their nearest neighbour:
https://stackoverflow.com/questions/57269254/how-to-impute-missing-neighbours-of-a-spatial-weight-matrix-queen-contiguity
The UK edition of the leading open source geospatial software conference is
happening in Edinburgh in September:
https://uk.osgeo.org/foss4guk2019/
there's a few talks with R, but also plenty of opportunity to expand your
geospatial knowledge beyond R.
Generous sponsorship has meant we have kep
your opinion of using these options vs creating an attribute.
> Thanks in advance,
> Vijay.
>
> On Tue, May 7, 2019 at 11:07 AM Barry Rowlingson
> wrote:
>
>> On Tue, May 7, 2019 at 12:54 PM Marta Rufino
>> wrote:
>>
>> > Hi,
>> >
>&g
On Tue, May 7, 2019 at 12:54 PM Marta Rufino
wrote:
> Hi,
>
> Two very simple question:
>
> 2)
> Can we change the polygon col/fill and point shape/col when exporting sf
> obejcts to kml, using the function:
> st_write(sf.object, " sf.object .kml", driver='kml')
>
>
Setting styles for writing KM
On Tue, May 7, 2019 at 12:54 PM Marta Rufino
wrote:
> Hi,
>
> Two very simple question:
>
> 1)
> What is the best way to add a variable (field) to an sf object?
>
> # For example, if I do:
> (a = st_sf(a=1, geom = st_sfc(st_point(0:1
> # I would expect this would work, and it does, but then i
On Fri, Apr 12, 2019 at 6:16 PM Marta Rufino
wrote:
> Hi,
>
> Now, the next issue will be how to transform the huge world wide sf points
> (that are actually 32 classes) into a 'multipolygons' sf. Maybe I should do
> a new post with a reproducible example for this new challenge, if I don't
> mana
ps-3A__www.gdal.org_drv-5Fgeopackage-5Fraster.html&d=DwIGaQ&c=n6-cguzQvX_tUIrZOS_4Og&r=fCPRb7QX-vd5bnO9gIJHCiX852SVUtyYX--xtCKtpfk&m=p5ULiF5de1gKZBP-IzWbMO9Pe5LFzv9uaZ5VJYnWw1Y&s=d6xaKGlN0jpd8mBdjKXAhzst7N3Bgo43BvJlLnDSngk&e=
> >
> > On 4/11/19, 11:41 AM, "Barry Rowlings
What did you try? The instructions at the top say:
"Download 3.3GB tile package and rename extension from .tpk to .zip.
Extract to get EMU.gpkg"
If that's a valid GeoPackage then `sf` should be able to read it. Not sure
what might be in the geopackage though, "tile package" sounds like rasters,
b
On Wed, Mar 13, 2019 at 6:14 PM Andy Bunn wrote:
> I would like to create averages of all the variables in a
> SpatialPointsDataFrame when points are within a specified distance of each
> other. I have a method for doing this but it seems like a silly way to
> approach the problem. Any ideas for
Possibly longer optim
runs would help or constraining the angles.
Anyway, interesting problem
Barry
On Wed, Feb 6, 2019 at 8:23 PM Barry Rowlingson
wrote:
> Do you want to generate these for input into some statistical process, or
> to generate some test data that looks a bit like real
; two examples of possible lines with 10 segments between
> the polygons).
>
> Thank you very much for you help,
> Hannah
>
> ---
> PhD Student |Ecology and Evolutionary Biology
> Texas A&M University
>
> On Wed, Feb 6, 2019 at 5:12 AM Barry Rowlingson <
>
[reposting to list after a bounce...]
Interesting, but I think we need more details...
Do the lines have to start and finish at specific locations in the polygons
- like the centroid, or anywhere?
So one line might be 3 segments of 10km each connecting two polygon
centroids that are 15km apart?
On Wed, Sep 5, 2018 at 12:56 AM, Erin Stearns wrote:
> Hello all!
>
> I hope this message finds you all well!
>
> I have 2 questions pertaining to the creation of interactive maps via
> Leaflet nested inside an RShiny app. One question has to do with
> computation while the other has to do with s
Just a quick note to point out that you can test installations on systems
without having to install such a system by using Docker. Fedora 28 images
are available on Docker Hub.
You have to figure out how to install the toolchain and other components
for building R etc but that helps make a reprodu
This question has also been posted to gis.stackexchange.com:
https://gis.stackexchange.com/questions/283607/spatio-temporal-anisotropy-in-r-stani-argument-in-vgmst-and-krigest/
and better answers than mine there are welcome...
Barry
On Tue, May 22, 2018 at 8:39 AM, Dr. Benedikt Gräler
wrote:
It seems the options are:
1. ggplot2 and raster use calc - scripts will have to use raster::calc or
ggplot2::calc to be ambiguous.
This is the painful solution. Scripts will break. Users will have to type
raster::calc or ggplot2::calc depending on the order they do
library(raster);library(ggplot
Works perfectly for me, with the same versions of everything:
> r <- raster(nrow=45, ncol=90)
> r[] <- 1:ncell(r)
> e <- extent(-160, 10, 30, 60)
> rc <- crop(r, e)
>
> packageVersion("raster")
[1] ‘2.6.7’
> version
_
platform x86_64-pc-linux-gnu
arch
27;ll certainly try out your alternative solution, based on the
> (s)apply function, to see which one is most efficient.
>
> Thank you so much again,
>
> PauloFR
>
>
> Às 18:16 de 25-04-2018, Barry Rowlingson escreveu:
> > Loop over the row indexes of an sf-class objec
h), so that I can apply it "automatically" to 25,000
> polygons. I am using the rgadl package, but I can switch to sf.
> Thanks for any help.
> Cheers,
> PauloFR
>
> Às 12:27 de 25-04-2018, Barry Rowlingson escreveu:
>
> Do you want great-circle distance or is your
Do you want great-circle distance or is your space small enough that you
can use planar coordinates?
Are your polygons all single rings or are there islands and/or holes? Does
that matter?
The straightforward way would be to coerce the polygons to points, compute
the distance matrix, then take th
`cell2nb` in spdep will do exactly that:
library(sp)
library(spdep)
plot(cell2nb(5,5),coords=expand.grid(1:5,1:5))
If you want the points as sp class objects, feed SpatialPoints from
expand.grid:
pts = sp::SpatialPoints(expand.grid(x=1:N,y=1:N))
Barry
On Wed, Apr 11, 2018 at 4:31 PM, Rober
On Tue, Mar 20, 2018 at 11:12 AM, Naura, Marc
wrote:
> Hi,
> I have produced a regression kriging model using gstats that I want to
> deliver to a wide range of users to predict values for new sites using the
> web or as part of a simple computer software (e.g. Visual Basic software).
> Is there
On Tue, Feb 20, 2018 at 3:51 PM, Javier Martínez-López <
javi.martinez.lo...@gmail.com> wrote:
> You can try OpenCPU (https://www.opencpu.org/). It works great!
>
I don't see anything WPS there. The advantage of implementing a WPS is that
it is then available to anything supporting the WPS standa
On Tue, Feb 20, 2018 at 3:13 PM, Dr. Benedikt Gräler
wrote:
> Dear Barry,
>
> I am not quite sure what you are targetting at:
> i) a solution to expose (geo) R functionality as a WPS on the web or
> ii) a R package to ease the access to an exposed WPS.
>
> Regarding i), there is WPS4R (as a follo
I'm wondering what's the state of WPS (Web Processing Service) client
implementations in R? All I can find are the abstract of a 2008 UseR! talk:
https://www.r-project.org/conferences/useR-2008/abstracts/Henneboehl+Pebesma.pdf
and what looks like code designed to call a custom WPS server in the G
I'd do this by saving the image on the graphics device as a PNG, then
creating a "world" file (with extension PNGW) from the coordinates of the
corners and the resolution of the PNG. This is a six line text file with
sufficient information to georeference a grid. That's enough for `gdal` to
underst
Here's a way - first let's make some sample data in a stack:
maker = function(d){raster(matrix(runif(16),4,4))}
rains = stack(lapply(1:10, maker))
so `rains` is a stack of 10 4x4 rasters with random numbers in. Now the
raster we want to test:
r1 = maker()
Okay, all set up. We have a raster a
ments trying to describe the ADM format seem to say it
is a bit hard to understand with variants changing substantial parts of the
structure - I suspect something like that has caused the problematic
conversion experienced.
Barry
On Tue, Dec 5, 2017 at 3:55 PM, Barry Rowlingson <
b.rowling...@lanc
There's a converter on sourceforge that claims it can convert adm to gpx,
and you can read gpx with rgdal:
https://sourceforge.net/projects/adm2gpx/
2017-12-05 15:45 GMT+00:00 Mauricio Mardones Inostroza <
mauricio.mardo...@ifop.cl>:
> Dear group
>
> Do you know some routine to transform .adm
Do you have a sample file you could share? I've tried a quick internet
search, and nothing sticks out.
There seems to have been one effort about seven years ago that died out:
http://gpsbabel.2324879.n4.nabble.com/Garmin-ADM-file-format-td3588.html
If you have a typical file and you know roughly
Here's what I think should happen:
Robert Hijmans lets us know what his vision of raster is, and how he plans
to support it.
He should say if he wishes to carry on as maintainer or not. If not, we
need a new maintainer and then we can think about moving development to
gitlab, or whatever.
Barr
This has been cross-posted to gis.stackexchange.com if people want to
tackle it there:
https://gis.stackexchange.com/questions/257175/buffer-from-points-using-dismo-r
Barry
On Sun, Oct 1, 2017 at 10:32 PM, Sergio A Estay
wrote:
> Hi everybody,
>
> I am trying to create a buffer around severa
On Sat, Sep 16, 2017 at 3:45 PM, Edzer Pebesma <
edzer.pebe...@uni-muenster.de> wrote:
>
>
> On 16/09/17 15:20, Eduardo Diez wrote:
> > Dear list,
> > I have a MULTIPOLYGON geometry set where the rings are in the wrong
> > direction and would like to correct that with *st_make_valid*. As I'm in
>
Your question is still a tiny bit imprecisely defined, since you haven't
said how you want this polygon to align to the axes. This function computes
the coordinates of an N-sided regular polygon centred at (x,y) of radius r,
of n sides, at angle theta:
ngon =
function(x,y,r,n,theta){
phi = seq(t
On Thu, Sep 7, 2017 at 7:35 PM, Miluji Sb wrote:
> Dear all.
>
> Is it possible to convert.identify iso3 country names to the seven
> continent names?
>
> # Asia, Africa, Antarctica, Australia, Europe, South America, and North
> America,
>
> I have tried the following:
>
> ###
> region <- merge(c
Slightly hacky method: sample lots of points along the line, over() the
points with the polygons, returns polygon IDs in order:
>
unique(over(spsample(the.line,1,"regular"),as(columbus,"SpatialPolygons")))
[1] 21 24 25 26 22
if the line goes back into a polygon with the same ID you'll see tha
You can convert a "trip" object to a SpatialPointsDataFrame with
as("SpatialPointsDataFrame",my_trip). Then you can use functions like
"spDistsN1" from sp to compute the distance from "home" to each point,
find the maximum, and then use "bearing" from the "geosphere" package
to get the bearing for
The classic t-test is something like "are boys taller than girls?".
Throw the boy's heights and the girl's heights into `t.test` and out
comes an answer (and a p-value). Now suppose you want to add a
covariate? Are these boys taller than these girls, accounting for any
difference in their parent's
On Fri, May 26, 2017 at 11:34 PM, Andy Bunn wrote:
> Does anybody out there interface with the google earth engine from R? I'm too
> old a dog to learn python. -Andy
Too old? Never! See: https://www.xkcd.com/353/
Given that the other supported option is Javascript
I suspect a solution usin
On Wed, Apr 5, 2017 at 8:27 AM, Musa, Kamarul Imran
wrote:
> str_typ2 <- as.ppp(str_typ, W = Win)
as.ppp is using the first two columns of your data frame for
coordinates, the first one in yours is the mark!
So you have:
> str_typ = data.frame(mark=sample(2,1135,TRUE), x=runif(1135,388992,
503
On Sat, Mar 11, 2017 at 12:38 PM, wrote:
> Dear R-Users,
> Please anyone to help me with this error:
>
> kriged=krige(Nmin~1,locationsDD,grid,model=vgm(1,"Exp",150,1))
> Error in bbox(newdata) : object not a >= 2-column array
>
> Thank you so much in advance!
Hard to debug without your data. Th
Searching GIS StackExchange for [r] and TopologyException might find you a few:
http://gis.stackexchange.com/search?q=%5Br%5D+topologyexception
[answered one of these just today:
http://gis.stackexchange.com/questions/227569/r-error-fortifying-dataframe-from-shapefile]
Barry
On Tue, Feb 7, 2017
On Sun, Jan 29, 2017 at 7:26 PM, Loïc Dutrieux
wrote:
> world <- getData(name = 'countries')
The world countries file download function has a hardcoded version in it:
> raster:::.countries
function (download, path, ...)
{
filename <- paste(path, "countries.RData", sep = "")
if (!file.exi
You made a couple of little mistakes! See below:
On Thu, Dec 29, 2016 at 5:51 PM, Felipe Carrillo via R-sig-Geo
wrote:
> Hi;I have a shapefile named 'Wolf' that I can display in google with the
> following code: # Show the shapefile on top of google
> writeOGR(Wolf, "Wolf.kml", "Wolf", driver=
able to say
> what the experiment died of. ~ Sir Ronald Aylmer Fisher
> The plural of anecdote is not data. ~ Roger Brinner
> The combination of some data and an aching desire for an answer does not
> ensure that a reasonable answer can be extracted from a given body of data.
> ~ John T
On Wed, Dec 7, 2016 at 10:43 PM, Michael Sumner wrote:
> I think there is now a majority opinion that fortify is not such a good
> idea for simple feature (or in general: spatial) geometries.
>
>
> It's not a great idea, but you can do it and it already works.
It works, for some values of "works
You can do it by rewriting `projection(r) <- Z` as a function, and
assigning it back to the same name. I think this captures the essence:
Two rasters with default projections (epsg:4326)
> r1 = raster()
> r2 = raster()
Loop over names, get, set projection, re-assign:
> for(rname in c("r1","r
On Mon, Oct 3, 2016 at 10:38 AM, Mathieu Rajerison
wrote:
> Hi R-List,
>
>
> I have a DEM on one hand, and on the other hand, I have an RGB aerial image
>
> I tried rasterVis and plot3D function, but I didn't find how to use the
> colors of my RGB aerial image.
from the help for plot3D:
drape:
Another way of visualising two values per pixel is to vary two of Hue,
Luminance, and Saturation. You can even use all three if you have
three variables!
Note that Hue is a circular variable, and in the example I saw it was
being used to map the seasonal peak of rainfall, so a circular
variable wa
Jim,
have you fixed this? There's a lot to look at here and is hard to see
what is going on because most of it is probably irrelevant to your
problem, and we can't run your code because we don't have your data or
shapefiles.
But if you run this with a screen device, does it put all the plots on
c(w,w))}),2,function(v){Polygons(list(Polygon(matrix(v,ncol=2,byrow=TRUE))),ID=runif(1))}))
> plot(polys)
> plot(d,add=TRUE)
Barry
On Thu, Aug 25, 2016 at 2:11 PM, Barry Rowlingson
wrote:
> 2016-08-25 13:01 GMT+01:00 Manuel Spínola :
>> Dear list members,
>>
>> H
2016-08-25 13:01 GMT+01:00 Manuel Spínola :
> Dear list members,
>
> Ho can I do square buffers around spatial points?
Break it down:
1. For each point compute the coordinates of the four corners of the
square by adding half the width of your square.
2. Construct a Polygon from those four points
On Thu, Aug 18, 2016 at 1:17 PM, Manuel Spínola wrote:
> Dear Barry,
>
> How I install the package?
With difficulty...
First you probably need to be running Linux and have Qgis 2.14 or
higher installed.
Install the rPython package into R - install.packages("rPython") may
work, or may need yo
Time to announce my little summer side project...
`pqgisr` is a *highly* experimental package to provide an easy way for
R programmers to use the cartographic features of Qgis without the
hassle of exporting objects, loading them into Qgis, and then having
to style them.
The package provides func
I don't think the point pattern analysis will help you at all - your
sampling locations aren't a point pattern (although they form a
pattern of points) - their location has been decided by whoever
decided where to take the samples. Point pattern analysis is
appropriate where you are interested in t
On Wed, Jul 13, 2016 at 4:22 PM, wrote:
> Hi everyone,
>
> I wanted to let people here know that I am sponsoring the "R Shapefile
> Contest":
>
> http://www.arilamstein.com/blog/2016/07/12/announcing-r-shapefile-contest/
>
> For the last few years I've done a lot of work with creating choropleth
On Wed, Jun 29, 2016 at 2:26 AM, Isaque Daniel
wrote:
> Hi everyone,
>
>
> I have been working in a model for spatial analysis and my problem now is
> generate some ellipses around of SpatialPointsDataFrame.
>
>
> I looking for some similar gBuffer of rgeos, but until now I can't find a
> soluti
Jannes,
did you consider using the rPython package? Its easy enough to import
qgis functionality, there's less overhead since you aren't spawning a
new python/qgis session for every command, you can save state between
python calls, and you hand-off the platform dependency to that
package.
Barry
Your example looks a bit rubbish because you have mostly isolated
pixels. Let's make an example with an area so we can see the shading.
> r.pvalue = raster(outer(-24:25,-24:25, function(a,b){a^2+b^2})/12)
> range(r.pvalue[])
[1] 0. 0.01041667
now convert your raster to polygons at the
The UK Chapter of OSGeo is holding a FOSS4GUK conference in Southampton in June.
I am quite confident there will be at least one workshop on mapping in
R there. We're taking proposals for talks and workshops, and also
early bird tickets - the web site is here:
http://uk.osgeo.org/foss4guk2016/
On Thu, Apr 21, 2016 at 8:19 AM, Roger Bivand wrote:
> Why we do what we do:
>
> Congratulations to Robert Hijmans and others maintaining the dismo package:
>
> https://cran.r-project.org/web/packages/dismo/index.html
>
> which is the computational basis for:
>
> http://elifesciences.org/content/5
write code to pass the options
into the JS, pull requests are welcome.
I'm not sure what the license on the coffee script code is, I think
its BSD, which means its okay to use this like this. Will investigate.
Incidentally, the V8 package is a very slick interface to JS from R. Impressed.
On Tue, Apr 12, 2016 at 10:48 PM, Tiernan Martin
wrote:
> Hi Barry –
>
> Are you referring to the javascript code detailed here:
> http://d3plus.org/assets/posts/largestRect/src/largestRect.coffee ?
>
> I don't know much about running javascript in R, but I would be willing to
> give it a shot for
Could you simply use the Javascript code in that web page via one of
the R-Javascript interface packages?
On Tue, Apr 12, 2016 at 8:42 PM, Tiernan Martin wrote:
> Does anyone know if there is an R package out there with an algorithm which
> finds the maximum-area rectangle that can fit within a n
>> the above input yields
>>
>> initial circle: -001.69467803 -000.69446643 006.23578103
>> converged after 7 iterations
>> final circle: -001.34339845 -001.34426151 006.44308386
>> with the format x,y,radius
>>
>> which at least make sense with respe
On Fri, Mar 18, 2016 at 6:49 PM, Chris Reudenbach
wrote:
> Because it seems to be an arc and not a circle issue that you can solve the
> problem by
> picking arbitrary two points of your assumed "arc" then construct
> (calculate) the perpendicular bisector of
> the line between them and do so for
On Fri, Mar 18, 2016 at 2:43 PM, Alex Mandel wrote:
> library(rgeos)
> gCentroid
>
> http://www.rdocumentation.org/packages/rgeos/functions/topo-unary-gCentroid
>
> Assuming its a circle that would be the center.
Only if you have points uniformly (or uniform-randomly) distributed
round the full e
I think you will have to take off the ggplot2 training wheels and do
it another way. Here's the outline:
1. Use kde2d to compute your kernel on a grid - you'll have to choose
the bandwidth and grid size, ggplot2 usually makes those decisions for
you. Something like:
k = kde2d(xy.df$x, xy.df$y,h=0
On Thu, Feb 25, 2016 at 5:11 PM, Agustin Lobo wrote:
> Is there any way to download the raster layers
> of openmap() with an increased resolution?
> I find the quality of the labels very low,
> or am I doing something wrong? i.e.
>
> require(raster)
> require(mapmisc)
> nica <- getData("GADM", cou
What's happened here is that part of the RHS of the buffer (from the
acute angle segment) has wrapped round so far that it has overlapped
with the LHS of the buffer from the first segment. So there's an area
which is both on the LHS of the line and the RHS. What do you want it
to be?
You could jus
FlexScan seems to be distributed as a closed-source Windows-binary
only piece of software:
https://sites.google.com/site/flexscansoftware/home
which raises lots of "avoid at all costs" red flags for me.
The methodology is published and could be re-implemented as an R
package by a smart enough pr
ogr2ogr on the command line does a better job. Having saved the square
as a shapefile I can do this:
$ ogr2ogr -f "DXF" output.dxf foo.shp
ERROR 1: DXF layer does not support arbitrary field creation, field
'Foo' not created.
- an error, but a file is created with features in it... ogrinfo tells
On Tue, 3 Nov 2015, Roger Bivand wrote:
>
>> On Tue, 3 Nov 2015, Barry Rowlingson wrote:
>>
>>> I don't think what I'm trying to do is "appending". I'm trying to
>>> write two spatial data tables with different names in the single
>&
;, layer_option="FORMAT=SPATIALITE")
Interestingly when I try and write with the *same* table name, rgdal
helpfully suggests "layer exists, use a new layer name", but when I
obey, I get the error behaviour I've described
Barry
On Mon, Nov 2, 2015 at 11:21 PM, Roge
I can create a SpatiaLite DB file and put a layer in it, but if I try
and add another layer, rgdal fails. Example:
Versions etc:
> require(rgdal)
Loading required package: rgdal
Loading required package: sp
prgdal: version: 1.0-7, (SVN revision 559)
Geospatial Data Abstraction Library extension
On Sun, Oct 18, 2015 at 9:33 PM, Jim Burke wrote:
> I would like to plot a cex(17) darkgreen triangle at a specific lat/long
> spatial map on an existing plot. Or a star at that location.
>
> How might I approach this?
>
> I saw an example (below) but so much like the internet not how to
> impleme
On Wed, Oct 7, 2015 at 10:04 AM, Paulo Flores Ribeiro
wrote:
> Try change cell size in your ascii text file (eg. instead of «cellsize
> 0,0012386489974299», try «cellsize 10,10»)
How is that going to do anything but break the geolocation of the raster?
I'm worried about the comma decimal separa
What do you mean by "cluster"? Aren't zip codes clustered more in
urban areas than rural anyway? What's the question you want answered
about the data?
There should be something in the spatial statistics realm that can
help you, but figuring out exactly what is the tricky bit...
Barry
On Thu, Oc
Tricky, because OGR (at least) doesn't have a 1-1 mapping of "file" to
"data source"
* I think any component of a shapefile can be used as a data source of
a single-layer. Command-line ogrinfo on my machine thinks so:
$ ogrinfo DSMW.dbf
INFO: Open of `DSMW.dbf'
using driver `ESRI Shapef
[Apologies for the memey subject: http://knowyourmeme.com/memes/x-all-the-y]
Developers can't fail to have noticed the rise of Javascript, both in
the browser and outside of it. But it has now crept into R, and into
R-spatial packages.
Javascript, like most languages, has its right to exist and i
This works: create a new SpatialPolygonsDataFrame with just your new
geometry, copying the data from the old geometry, and then use cbind
and selection to create a new object:
theNew <-
list(Polygons(list(Polygon(cbind(c(r[1,1],r[1,1],r[1,2],r[1,2],r[1,1]),c(r[2,1],r[2,2],r[2,2],r[2,1],r[2,1]
On Mon, May 11, 2015 at 11:52 AM, Roger Bivand wrote:
> On Mon, 11 May 2015, Barry Rowlingson wrote:
>
>> If you go far enough into the file (which appears to be without line
>> breaks, so somewhere on line 1... You'll see:
>>
>> "arcs":[[[7533,1255]
ot;OGRGeoJSON"
with 632 features and 3 fields
Feature type: wkbPolygon with 2 dimensions
H
Barry
On Sun, May 10, 2015 at 6:38 PM, Roger Bivand wrote:
> On Sun, 10 May 2015, Barry Rowlingson wrote:
>
>> On Sun, May 10, 2015 at 4:31 PM, Daniel Marcelino
>> w
On Sun, May 10, 2015 at 6:12 PM, Barry Rowlingson
wrote:
> Solution is usually "use gdal/ogr tools to convert to plain old
> geojson (ogr2ogr)"
Actually that's a really stupid solution. If ogr2ogr can do it, you
need the support in the first place! Doh!
You need a sep
On Sun, May 10, 2015 at 4:31 PM, Daniel Marcelino wrote:
> Dear all, I'm having the following issue when trying to read a
> topographical json file:
That's a **topological** (not topographical) geojson file. Instead
of recording each polygon separately, and thus duplicating common
boundaries, a
On Wed, Apr 29, 2015 at 2:36 PM, Antonio Serrano via R-sig-Geo
wrote:
I suspect we may need some clarification...
> I have a map which has been produced by a Fortran program. I have the
> sources of this Fortran program and can produce the map in many formats: eps,
> ps, png, jpeg, svg, et
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