6,820 reputation
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location Redlands, CA
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visits member for 3 years, 10 months
seen 13 hours ago

I've been working with map projections and datum transformations for years, including in ArcView GIS, ArcInfo 7 and up, MapObjects, and ArcGIS.


13h
answered Lambert_Conformal_Conic: converting from shapefile to geojson fails
20h
comment calculating decimal degrees from coordinates found in an excel table
It's not exactly the same because it assumes the 3 values are in the same field, but Converting degree-minute-second values into decimal degree values
1d
comment ArcGIS Change from projected WGS84 to Geographic WGS84
Honestly? The question doesn't show much research effort. Searching projection (with or without tool) in the help will bring several applicable topics. One way to get DMS values is to use the Convert Coordinate Notation Tool, but you'll already have had to add the latitude and longitude values to the attribute table.
1d
comment How to convert PCS based point X/Y into GCS Lat/Lon using ArcObjects
@Draek if you're able to create a spatialreference/coordinate system from a .prj file, then ArcGIS can use it. Now if the definition doesn't actually match the data values, that's a different issue! I've tried the test points you've posted, and they're working fine for me. Getting +91 when it should be +92 does imply that there's something wrong about the SpatRef definitions.
1d
comment ArcGIS Change from projected WGS84 to Geographic WGS84
See the Project or Project Raster Tools in the Data Management toolbox, Projections and Transformations toolset.
2d
comment How to convert PCS based point X/Y into GCS Lat/Lon using ArcObjects
I think the input values are in feet, not meters. Depending on which version you have, see if there's a NAD27 BLM 3 coordinate system available. It uses US survey feet for the units.
2d
revised Using QGIS to access data delivered by ArcGIS for Server?
fixed link error identified by Leasye
2d
reviewed Edit suggested edit on Using QGIS to access data delivered by ArcGIS for Server?
2d
revised Using QGIS to access data delivered by ArcGIS for Server?
fixed typo and link
2d
awarded  Constituent
2d
comment Cannot convert dms to dd in Excel 2007 using VBA code
Great! It's possible the original "degree" symbol wasn't really the correct one. There are characters that look like the degree symbol in some fonts and it's easy to confuse them.
2d
comment Cannot convert dms to dd in Excel 2007 using VBA code
Per gis.SE standards, question should probably be closed or migrated due to general (not really GIS-specific) content.
2d
answered Cannot convert dms to dd in Excel 2007 using VBA code
2d
comment Cannot convert dms to dd in Excel 2007 using VBA code
Are the longitude and latitude values in separate fields?
2d
reviewed Edit suggested edit on Cannot convert dms to dd in Excel 2007 using VBA code
2d
revised Cannot convert dms to dd in Excel 2007 using VBA code
reverted the """ at the end of the sample; MS doc has a note about it.
2d
reviewed Approve suggested edit on Tool to search for repeated codes in ArcGIS 10.1
Aug
15
reviewed Approve suggested edit on QGIS 2.4 : How to search an Attribute Table?
Aug
15
comment ArcGIS WGS84 Web Mercator Vs. WGS84 UTM zone 15N: Very different distance dimensions
Well, you should use WGS 1984 Web Mercator (Auxiliary Sphere) instead which would put the data on WGS84. However, due to a quirk in how WGS 1984 Web Mercator is used, there's no geographic/datum transformation needed between it (WGS 1984 Major Auxiliary Sphere and WGS 1984. "On-the-fly" will convert between data that's using different GeoCRS but setting a transformation may be needed.
Aug
11
awarded  Caucus