Re: [Matplotlib-users] Basemap to KML polygon
Hi Tim, like I said, I want to convert a filled contours map generated with Basemap (example here : http://imagebin.ca/view/3nYnN3.html) to a polygon shapefile (vector). The filled contours are from a regular points grid which can already be saved into a point shapefile (via ogr python bindings) and I use QGIS to render it. Now I search to get the filled result into a shp file to pass it through ogr2ogr -f KML and render it with GoogleEarth. I know I can do all this process with the QGIS-GRASS interface, but I must limit softwares dependencies 'cause it'll be placed on a web server, and I think Python it's the best choice for doing that :-) After multiple tests, I can retrieve the polygons points coordinates via matplotlib.Patch and save them in a shp file. Now I have troubles with real coordinates and meta-datas, but nothing impossible :-) Tim Michelsen a écrit : Looks like I've done a mistake with my last post, sorry Eli... I know how to save datas to a shapefile with the OGR library but only for points datas. I'll appreciate if somebody can point me how to save a filled contour map basemap into a polygon shapefile, can't find any example with google. What do you really want to save here? A basemap with a contour surface overlayed can be viewed as a assembly of various layers. So this is like the result of the gis operations when you launch the map composer to finish your map. If you want to create a raster file from the contour part plotted over a basemap I think the python bindings of gdal will get you started. http://pypi.python.org/pypi/GDAL/ I succeded into writing a tiff file from a gdal array. I don't know how to write a vector file from python with ogr or shapely. But these questions are better to be asked on the gdal list.: So about interpolating to a contour look at shapely. Writing should be accomplished with ogr. That said, I only have testing experience with writing geodata with python. The overkill may be to invoke the respective GRASS command by a script. I would appreciate if you would tell us what you use by the end. Kind regards, Timmie When it comes to python and GIS the first stop seems to be: * http://gispython.org/ * http://lists.gispython.org/mailman/listinfo/community Some more links: * http://de.giswiki.net/wiki/Kategorie:Python * http://de.giswiki.net/wiki/WorldMill * http://zcologia.com/news/750/keytree/ * http://sgillies.net/ - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- Lionel Roubeyrie - [EMAIL PROTECTED] Chargé d'études et de maintenance LIMAIR - la Surveillance de l'Air en Limousin http://www.limair.asso.fr - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Basemap to KML polygon
Lionel Roubeyrie [EMAIL PROTECTED] 07/23/08 9:37 AM I want to convert a filled contours map generated with Basemap (example here : http://imagebin.ca/view/3nYnN3.html) to a polygon shapefile (vector). After multiple tests, I can retrieve the polygons points coordinates via matplotlib.Patch and save them in a shp file. Now I have troubles with real coordinates and meta-datas, but nothing impossible :-) Hi, If you're after a 'quick and dirty' solution. As I understand it a KML file can be used to specify the Latitude and Longitude extent of a raster image (See 'Ground Overlays' at http://code.google.com/apis/kml/documentation/kml_tut.html). If you can accept some distortion of the text on your image (should be small with a small region) and can work out the size of each pixel in degrees of lat and lon, then all you need to do is write a simple text file to specify where Google Earth should display your Basemap contour map. What you're doing does sound more elegant, but more complex. Regards, Scott Please find our Email Disclaimer here: http://www.ukzn.ac.za/disclaimer/ - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Scaling--I couldn't find it, but should this be in FAQ list?
On Tue, Jul 22, 2008 at 4:54 PM, John Hunter [EMAIL PROTECTED] wrote: On Tue, Jul 22, 2008 at 4:06 PM, Jonathan Hayward http://JonathansCorner.com [EMAIL PROTECTED] wrote: Thank you; I've shrunk the graphic part. Please respond to the mailing list (reply to all) Oops; sorry. When I save it as an image, it's painting an 800x600 image, so I've shrunk the portion of the 800x600 image I'm using. Is there a way to crop or do something comparable? Not sure I understand the question. You can control the figure size in pixels by setting the figure size in inches and the dpi -- the pixel size is the prodict of the two fig = figure((8,6), dpi=100) # 800x600 When I tried placing that line in a couple of places, I got an error: [EMAIL PROTECTED] ~/bin $ ./barchart Traceback (most recent call last): File ./barchart, line 6, in ? fig = figure((8,6), dpi=100) File /usr/lib/python2.4/site-packages/matplotlib/pyplot.py, line 186, in figure FigureClass=FigureClass, File /usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtkagg.py, line 44, in new_figure_manager return FigureManagerGTKAgg(canvas, num) File /usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtk.py, line 405, in __init__ self.window.set_title(Figure %d % num) TypeError: not all arguments converted during string formatting Are there other things it needs? (I tried placing a space so 8,6 would read 8, 6, but it didn't significantly change the error.) you can control the *relative* proportion of the axes by using the axes command as before ax = axes([left, bottom, width, height]) with these two, you should be able to get whatever size and proportions you want. JDH -- -- Jonathan Hayward, [EMAIL PROTECTED] ** To see an award-winning website with stories, essays, artwork, ** games, and a four-dimensional maze, why not visit my home page? ** All of this is waiting for you at http://JonathansCorner.com ++ Would you like to curl up with one of my hardcover books? ++ You can now get my books from http://CJSHayward.com - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Scaling--I couldn't find it, but should this be in FAQ list?
On Wed, Jul 23, 2008 at 9:06 AM, Jonathan Hayward http://JonathansCorner.com fig = figure((8,6), dpi=100) # 800x600 When I tried placing that line in a couple of places, I got an error: Sorry, my fault, you need the keyword argument figsize: In [1]: import matplotlib.pyplot as plt In [2]: fig = plt.figure(figsize=(8,6), dpi=100) # 800x600 - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Border appearance
On Tue, Jul 22, 2008 at 4:57 PM, John Hunter [EMAIL PROTECTED] wrote:
On Tue, Jul 22, 2008 at 4:28 PM, Jonathan Hayward
http://JonathansCorner.com [EMAIL PROTECTED] wrote:
On the two routines I'm modifying from examples, boundaries and borders
are
generally a hefty black.
How can I control color and/or thickness and/or turn off items like
boundaries that are drawn in black?
There are two borders in question, the figure border and the axes
border. Both are rectangle instances. You can control the figure
border with the figurePatch instance
How do I query/set the figure in question?
I was specifying the axes earlier, and setting a linewidth of 0 seemed to
remove one of two borders (or, from a non-technical perspective, made the
border half as thick). See before.png and after.png: getting closer at
least...
fig.figurePatch.set_edgecolor('white')
fig.figurePatch.set_linewidth(0.5)
and similarly for the axes axesFrame instance
ax = axes([left, bottom, width, height])
ax.axesFrame.set_edgecolor('red')
ax.axesFrame.set_linewidth(0.5)
You can make the frame invisible in a few different ways:
* set the edgecolor to be the same as the face color
* set the linewidth to 0
* set the visible property to False (ax.axesFrame.set_visible(False))
JDH
--
-- Jonathan Hayward, [EMAIL PROTECTED]
** To see an award-winning website with stories, essays, artwork,
** games, and a four-dimensional maze, why not visit my home page?
** All of this is waiting for you at http://JonathansCorner.com
++ Would you like to curl up with one of my hardcover books?
++ You can now get my books from http://CJSHayward.com
attachment: before.pngattachment: after.png-
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Re: [Matplotlib-users] Basemap to KML polygon
thanks for this link Scott, I went into the refernce API directly without looking at this tutorial. Effectively, it works :-) Scott Sinclair a écrit : Lionel Roubeyrie [EMAIL PROTECTED] 07/23/08 9:37 AM I want to convert a filled contours map generated with Basemap (example here : http://imagebin.ca/view/3nYnN3.html) to a polygon shapefile (vector). After multiple tests, I can retrieve the polygons points coordinates via matplotlib.Patch and save them in a shp file. Now I have troubles with real coordinates and meta-datas, but nothing impossible :-) Hi, If you're after a 'quick and dirty' solution. As I understand it a KML file can be used to specify the Latitude and Longitude extent of a raster image (See 'Ground Overlays' at http://code.google.com/apis/kml/documentation/kml_tut.html). If you can accept some distortion of the text on your image (should be small with a small region) and can work out the size of each pixel in degrees of lat and lon, then all you need to do is write a simple text file to specify where Google Earth should display your Basemap contour map. What you're doing does sound more elegant, but more complex. Regards, Scott Please find our Email Disclaimer here: http://www.ukzn.ac.za/disclaimer/ - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- Lionel Roubeyrie - [EMAIL PROTECTED] Chargé d'études et de maintenance LIMAIR - la Surveillance de l'Air en Limousin http://www.limair.asso.fr - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
