[Qgis-user] trouble with projections

[Kirk Wythers]

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]]


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> On Thu, Mar 15, 2012 at 1:10 PM, Kirk Wythers <kirk.wythers at gmail.com> 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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