BTW, looking at your original post, it seems that all three layers
were recognized - incorrectly - by QGIS as Albers Equal Area. THis
might mean that your QGIS is configured to automatically assume all
unknown layers are in Albers Equal Area. (Have a look at Settings
-> Options -> CRS). If this is the case, then it's important
that each layer includes a properly defined CRS, such as a correct
*.prj for the shapefiles.
It's worth repeating that the setting in the layer's Properties
window "Specify CRS" does NOT change the layer's projection. It only
attaches a CRS declaration to the layer, indicating to QGIS how it's
projected. So:
- you must know in advance what CRS the layer is referenced in
- if the layer does not already have a *.prj, then use the "Specify
CRS" to correct this
- now you can either use "on-the-fly" to display layers in different
CRS's, or
- "Save As..." to explicitly re-project the layer to a CRS of your
choice.
Regards,
Micha
On 03/15/2012 07:58 PM, Kirk Wythers wrote:
On Mar 15, 2012, at 12:14 PM, Lee wrote:
Do you know what EPSG these files are
supposed to be in as obtained? I realize you would like to use
them or reproject them to 3174, but what is their native EPSG
or CRS name?
I got the shape files from a colleague and am not sure.
Here are the text descriptions from the .prj files:
File 1
GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]
File2
GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]
File3
PROJCS["WGS_1984_Web_Mercator",GEOGCS["GCS_WGS_1984_Major_Auxiliary_Sphere",DATUM["D_WGS_1984_Major_Auxiliary_Sphere",SPHEROID["WGS_1984_Major_Auxiliary_Sphere",6378137.0,0.0]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],UNIT["Meter",1.0]]
On Thu, Mar 15, 2012 at 1:10 PM, Kirk
Wythers <[email protected]>
wrote:
I am having trouble
with the crs of a particular project which contains 3
shape file layers. I have two layers with display
properly relative to each other, however, I am dubious
that the crs is correct, since they are lat long yet the
scale bar is displaying meters. I have another shape
file, that when read into qgis, does not display
properly at all.
I have tried turning off "on the fly" projections,
loading one layer, then turning on "on the fly" for
the other layers. I have also tried manually setting
the project crs with to one of the layers. I have also
tried manually setting the crs of each layer to EPSG
3174 (Great Lakes Albers). None of these approaches
seems to have any effect on the problem.
Ideally I would like all files to be EPSG 3174 with
units of degrees as Lat Long. Any suggestions on how I
should be approaching this? Thanks in advance.
Here is the crs metadata for each file:
FILE 1:
|
Storage
type of this layer: ESRI Shapefile
|
|
Source for this
layer:
/Users/kirkw/Desktop/latlong/meanNH4_2002.2006CLIP.shp
|
|
Geometry type of the
features in this layer: Polygon
|
|
The number of
features in this layer: 2093
|
|
Editing capabilities
of this layer: Add Features, Delete
Features, Change Attribute Values, Add
Attributes, Create Spatial Index, Fast
Access to Features at ID, Change
Geometries
|
|
Extents:
|
|
In layer spatial
reference system units : xMin,yMin
-95.917,43.0309 : xMax,yMax
-83.2767,49.3746
|
|
Layer Spatial
Reference System:
|
|
+proj=aea
+lat_1=42.122774 +lat_2=49.01518
+lat_0=45.568977 +lon_0=-84.455955
+x_0=1000000 +y_0=1000000 +ellps=GRS80
+towgs84=0,0,0,0,0,0,0 +units=m +no_defs
|
FILE 2:
|
Storage
type of this layer: ESRI Shapefile
|
|
Source for this
layer:
/Users/kirkw/Desktop/disturbance/reservelands/national_parks_boundaries_BTS_2006/national_parks_boundaries_BTS_2006.shp
|
|
Geometry type of the
features in this layer: Polygon
|
|
The number of
features in this layer: 555
|
|
Editing capabilities
of this layer: Add Features, Delete
Features, Change Attribute Values, Add
Attributes, Create Spatial Index, Fast
Access to Features at ID, Change
Geometries
|
|
Extents:
|
|
In layer spatial
reference system units : xMin,yMin
-167.535,18.4641 : xMax,yMax
-66.1064,68.6554
|
|
Layer Spatial
Reference System:
|
|
+proj=aea
+lat_1=42.122774 +lat_2=49.01518
+lat_0=45.568977 +lon_0=-84.455955
+x_0=1000000 +y_0=1000000 +ellps=GRS80
+towgs84=0,0,0,0,0,0,0 +units=m +no_defs
|
FILE 3:
|
Storage
type of this layer: ESRI Shapefile
|
|
Source for this
layer:
/Users/kirkw/Desktop/disturbance/reservelands/Wilderness_Areas/Wilderness_Areas_12.1.11.shp
|
|
Geometry type of the
features in this layer: Polygon
|
|
The number of
features in this layer: 794
|
|
Editing capabilities
of this layer: Add Features, Delete
Features, Change Attribute Values, Add
Attributes, Create Spatial Index, Fast
Access to Features at ID, Change
Geometries
|
|
Extents:
|
|
In layer spatial
reference system units : xMin,yMin
-19942895.95,2066644.91 : xMax,yMax
20012095.73,11022781.37
|
|
Layer Spatial
Reference System:
|
|
+proj=aea
+lat_1=42.122774 +lat_2=49.01518
+lat_0=45.568977 +lon_0=-84.455955
+x_0=1000000 +y_0=1000000 +ellps=GRS80
+towgs84=0,0,0,0,0,0,0 +units=m +no_defs
|
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_______________________________________________
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This mail was received via Mail-SeCure System.
--
Micha Silver
Arava Development Co. +972-52-3665918
http://surfaces.co.il
|
