New answers tagged coordinate-system
3
One of the strange Limitations of ArcMap, is that it only looks at the name of the projection, and doesn't actually check the parameters, if the name is different.
I've often faced this problem when data comes from other software. That software might use the correct parameters for say UTM 43N, but the name is not what ArcGIS expects. And all ArcMap can do, ...
0
I am able to find the reason for the above error. It looks like an ESRI bug to me.
One of the parameter that I pass to gp.Execute() method is a FeatureSet. This FeatureSet contain a polygon with empty geometry and few attributes. My output will add geometry to this FeatureSet.
When map's spatial reference is GCS, the GP tool works fine. But when the spatial ...
0
Thank you for your responses, I managed to solve my problem.
I projected the dem using the "Project raster" tool and my shapefiles using the "Project" tool in ED50 UTM 35N. I saved the project and closed ArcMap, then opened an empty ArcMap and imported the transformed raster so that the coordinates are displayed within the new coordinate system.I ran my ...
1
You assigned the wrong id on load. Looks like you have a UTM projection.
Now need to transform to right geometry.
UPDATE zones
SET geom = st_transform( st_setsrid( geom, 31997 ), 4326 )
2
I think, technically, this 'question' should be split into several questions! I going to try to answer your questions or clarify your statements out of order because I think it will make more sense.
A coordinate reference system, when used in the GIS field, is a generic term for a reference framework that's used to locate points (lines, polygons, etc). ...
2
Try just setting project CRS and enabling on-the-fly reprojection. Don't touch the layer properties. If the Shapefile .prj definitions are read correctly by QGIS, that's all you need to do.
Similar questions:
Why don't my Shapefiles and OSM data overlap in Quantum GIS?
QGIS layers no longer overlay when Enable 'on the fly' CRS transformation ...
0
If you're working with the local ellipsoid then it's a better distance approximation than the pythagorean distance, reason for that (in my knowledge) is quite simple : ellipsoid is meant to be a better approximation to distances. So unless you're working with a non-local ellipsoid, it's the way to go.
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This link may be helpful to you, it mentions a pitfall that projects your coordinates into the wrong location:
The Impossible Made Possible: Projecting Greek Data into UTM
3
See the OGR Projections tutorial and the OGRSpatialReference class. In particular, the GetAttrValue method.
Here's a worked example.
from osgeo import gdal,osr
ds=gdal.Open(r'SOMERASTER.TIF')
prj=ds.GetProjection()
print prj
srs=osr.SpatialReference(wkt=prj)
if srs.IsProjected:
print srs.GetAttrValue('projcs')
print srs.GetAttrValue('geogcs')
For my ...
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Here's one for Arc that goes through several scenarios using vector data:
http://blog.geographyforever.org/2013/03/25/working-with-spatial-reference-systems-in-arcgis/
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If it says it's Lambert Conic Conformal 2SP then its EPSG Code should be 9802. You can check for remotesensing.org for more details.
1
The answer to your Question is that is very much possible to change the spatial reference of your map, but only if you do not have any tiled layers in it.
To set the spatial reference, just make an new Exent in your required spatial reference, and then set your map's Extent to this extent. In Case you have some tiled layers, remove them before doing this.
...
2
The metadata are available on the web site. Clicking on any of the choices gives an extensive metadata listing in a standardized (extremely verbose) format. For instance, from the metadata for Alabama 2012 I find (in the "spatial reference section" near the end) the following:
FOR CROPSCAPE USERS: Albers Conical Equal Area is the native projection used in ...
1
perhaps it is (lack of) datum transformation in the projection operation? Your symptom sounds familiar. It is a common problem here in WI - GPS uses the WGS84 datum, but our state system uses NAD83HARN. The symptom of doing a projection without datum transformation is that coordinates are systematically offset a few meters in X and ~meter in Y.
1
Yes, your example seems logical, however I think you mean georeference not geocode. To start this setup you can do the following:
Create a new polygon feature class defined with a spatial reference (in meters) that matches your geographic area of interest.
Load in your polygon layer into ArcMap and start an edit session on it.
Zoom in on the map to the ...
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