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location Redlands, CA
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visits member for 4 years, 2 months
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I've been working with map projections and datum transformations for years, including in ArcView GIS, ArcInfo 7 and up, MapObjects, and ArcGIS.


2d
comment Generic term for CRS axes?
@Vince Only if you're using a CRS that specifies that. There are systems that label the Northing as X and Easting as Y. Mintx, why not check the CRS type and change the labels to match?
2d
comment Spatial Reference Conversion
I probably misunderstood (again; brain on holiday is broken). You've got coordinates in SVY21 and you want to display them with Google Map data/base map? But what about the OneMap base map? I guess I'm wondering if you can expand about what different data types you have.
2d
comment Spatial Reference Conversion
The link you have lists two services that are using EPSG:3857 ("Web Mercator"). Can you use one of those instead?
Dec
24
reviewed Close Split polygon based on line qgis
Dec
24
comment Is Geoenrichment a trademarked Esri term?
A custom time range Google search shows that Yahoo used the term in 2007 and Esri also was using it in 2008. This was not an exhaustive search, but highlights that it's not a recent term.
Dec
24
comment Is Geoenrichment a trademarked Esri term?
It's also not in TESS, the US trademark electronic search system.
Dec
23
comment Aligning data in GCS_North_American_1983 and GCS_North_American_1927 using ArcGIS for Desktop?
If the data is within the lower 48 states, pick NAD_1927_To_NAD_1984_NADCON. If the data is elsewhere, tell us so a more appropriate tfm can be recommended. How far off is the data?
Dec
19
answered Proper transformation file to go from NAD83 CSRS UTM 17 to NAD83 UTM 17
Dec
19
comment Regarding spatial relationships, what is the Dimensionally Extended 9 Intersection Model (DE-9IM)?
possible duplicate?
Dec
19
reviewed Close How to convert Whitebox .dep files for use in e-Cognition?
Dec
19
comment How to convert Whitebox .dep files for use in e-Cognition?
What are .dep files? (what software produces them)
Dec
19
revised What does 'Course Made Good' in NMEA string mean?
Must fix NMEA misspelling and tag...
Dec
19
answered What does 'Course Made Good' in NMEA string mean?
Dec
18
reviewed Reviewed Run OTB commands in OSGeo4W Shell scripts
Dec
18
comment Run OTB commands in OSGeo4W Shell scripts
My guess is that the location of the command's executable is not known to the operating system. Try adding its folder to your path. In the OSGeo3W shell, it has that information, thus the command works.
Dec
18
reviewed No Action Needed Moving (translating and scaling) a polygon in a shapefile
Dec
17
comment Custom CRS in Qgis web - client
I don't know anything about QGIS thus a comment that someone can incorporate into an answer if needed. Your definition is either EPSG:3911 which uses MGI 1901 GeoCRS or EPSG:3794 based on Slovenia 1996 (ETRS89-equivalent at 1995). The first one would need a transformation to get to WGS84. a = semimajor/equatorial axis of ellipsoid; b = semiminor/polar radius.
Dec
17
comment ITRF2008 to WGS84 Datum Transformation in ArcMap?
If you only need 1 m, redefine the data's coordinate reference system as WGS84. WGS84 is now kept aligned with ITRF at the 10 cm level. BUT, this document states that ITRF2008 and G1674 "are likely to agree at the cm level." It also states that there is no tfm available.
Dec
17
comment Is there a formula for calculating 2D map distance from 3D information?
I'm sorry but where are you getting the 208.73 value? Should it be the length in a particular projected CRS? If so, perhaps the calculator is returning the geodesic or great circle distance instead. Plus,what's the coordinate system of the map?
Dec
16
reviewed Reviewed Best solution for tiling a geotiff?