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17/20 answers
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2d
comment How to measure the accuracy of latitude and longitude?
@sepideh Thank you very much! I am grateful for your help.
Sep
1
awarded  Nice Answer
Aug
31
reviewed Leave Open How do I find out the sea levels?
Aug
31
comment How do I find out the sea levels?
@Adam has a good idea--but the method is not entirely straightforward. Starting with a point where you know the sea is (and which therefore should have an elevation of zero or less in the DEM), you can incrementally flood the DEM by slowly raising the sea level up to zero. The technique is described and illustrated at quantdec.com/SYSEN597/studies/flood .
Aug
31
reviewed Looks OK ArcGIS map service layer not loading properly
Aug
31
reviewed Looks OK How to output points using TerraScan based on selected shape and text of block boundary
Aug
31
reviewed No Action Needed Google Maps click event does not work on mobile devices
Aug
30
comment How to measure the accuracy of latitude and longitude?
@sepideh I like the idea of encouraging questions about the broader uses and applications of GIS, aka "Geomatics." Perhaps a better place to have such a discussion would be on our meta site.
Aug
28
comment Averaging Cartesian ECEF coordinates then converting to WGS84 without latitude drift
The ECEF->WGS84 code is unnecessarily complicated. The correct equations are much simpler. Where does this code come from?
Aug
28
reviewed Leave Open What are the main issues of creating DXF not from Autodesk Products?
Aug
28
reviewed Leave Open How to identify train stations from (vague) codes?
Aug
28
reviewed Close Monitoring of aerosol pollution?
Aug
28
comment Can I merge an Access database with a shapefile into a file geodatabase?
Exactly how are you trying to perform the join and what problems are you having?
Aug
28
reviewed Close Can I merge an Access database with a shapefile into a file geodatabase?
Aug
28
reviewed Close Count a great number of fields with Summary statistics
Aug
28
reviewed No Action Needed Using Iterate Feature Selection export features to new feature class with unique names
Aug
28
reviewed Looks OK Max Number of Feature Selection in ArcGIS and QGIS
Aug
27
comment In what coordinate systems do true circles appear round?
@mapBaker Unfortunately no; I don't have any current contacts there. I'm not even sure they would want to adjust it. There's a fine line between being correct and being pedantic. I believe they might have valued simplicity of exposition and--for their particular audience--did not want to get into the distinction between the preservation of geometric properties on large scales versus small scales. I value simplicity of exposition, too, but made an effort in this answer to find a more accurate compromise between simplicity and correctness by emphasizing sufficiently small circles.
Aug
27
comment In what coordinate systems do true circles appear round?
@mapBaker Thank you for offering that link. Its characterization of a conformal projection unfortunately is incorrect: "A conformal projection maintains shapes such as rectangles." This is true only for infinitesimal shapes, not for shapes of finite size.
Aug
26
reviewed No Action Needed How to generate Tiles with QGIS