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18h
comment Featureclasses with attachments: objects cannot be updated outside edit session
Isn't this basically the same answer you gave at gis.stackexchange.com/a/156843/664? If so, perhaps we should close this thread as a duplicate of the other.
18h
reviewed No Action Needed Can I use an Update cursor with a versioned feature class which has attachments in ArcObjects .NET
22h
revised After how much distance does the x,y coordinate system become noticeably distorted?
edited body
Jul
31
comment Performing Regression Analysis using ArcGIS for Desktop?
Doing the join in the other order should solve the problem.
Jul
30
comment Multiple CON Expression in ArcGIS Raster Calculator
Why use con at all? !(("Raster1"==20) | ("Raster1"==24)) should do it. You could even use alternatives like abs("Raster1"-22)!=2. Although that's a poor choice--it's harder to understand--it leads to a superior solution for floating point rasters, whose values might not exactly equal 20 or 24. You can now easily add a tolerance, such as abs(abs("Raster1"-22)-2)>0.00001. That helps you avoid a nasty pitfall. (Note that the details of the syntax depend on what version of ArcGIS you are using.)
Jul
30
comment Algorithm for offsetting a latitude/longitude by some amount of meters
Somebody else attempted to edit this answer to replace the cosine of the latitude by the cosine of the longitude. That's definitely wrong; I rolled back the edit.
Jul
30
revised Algorithm for offsetting a latitude/longitude by some amount of meters
rolled back to a previous revision
Jul
30
comment How can I conduct dimension reduction using Geographically Weighted Principal Component Analysis?
How exactly do these functions assess "importance" of components? This is a key question because there are many different ways to determine "importance" in PCA (and most of them are controversial).
Jul
30
comment Find Intersection of Two Circle given Lat/Lon and radius
Math.cos etc. expect their arguments to be in radians, not degrees.. However, your function convertRadians clearly does not return radians (nor does it even return "NM", if that's intended to be nautical miles).
Jul
30
reviewed Looks OK OpenLayers3: How to selecting a feature by dropdown menu and zoom?
Jul
30
reviewed Looks OK Multipatch to collada crash
Jul
29
comment How to access adjacent rows with cursor?
+1 This is a good solution because it can be used in a way that respects the relational data model. In this model, the sequence in which rows are processed is undefined, so any procedure that relies on the assumption that they will be iterated in the same order displayed in a table view ought to be considered unreliable. By using any key--not just OBJECTID--this solution can reliably identify neighbors according to the values of that key. However, dictionaries don't ordinarily support a "next" or "previous" lookup. You need something like a Trie.
Jul
29
comment Deriving strike and dip from DEM?
Exactly what does the DEM represent--elevations of a contact or upper surface of a formation, perhaps? If so, then presumably it is the result of a field investigation, leaving us wondering what you're actually asking. Could you edit this question to clarify this?
Jul
29
comment Defining the azimuthal equidistant projection of an Environment Canada weather radar map
@digital Because latitude and longitude do not enjoy the same Pythagorean relationship as x and y in a Euclidean plane. In particular, the top and bottom sides of the map are not lines of latitude. One way to appreciate what might fail is to consider the polar aspect. If the Prime Meridian were straight to the right in the map, then the longitude 240 km west of the center would be 180 degrees, but the longitudes of the left corners would be near +135 and -135 degrees. The discrepancy for oblique aspects, such as the one shown here, is not quite as great but is still substantial.
Jul
29
reviewed No Action Needed How to Convert Just a Sulawesi Map to Leaflet
Jul
29
reviewed Reviewed Showing multiple burials in same grave for Cemetery GIS?
Jul
29
comment Defining the azimuthal equidistant projection of an Environment Canada weather radar map
Any limitations inherent in QGIS wouldn't necessarily apply to ArcGIS.
Jul
29
comment Defining the azimuthal equidistant projection of an Environment Canada weather radar map
@Digital Unfortunately that is incorrect--your prescription assumes lat-lon is a Euclidean coordinate system, which it is not. However, one can use the map to compute the distances of the corners from the center (use the Pythagorean theorem, because all distances from the center are true) as well as their bearings (because the projection is conformal at the center) and then use geodetic forward calculations to find their coordinates.
Jul
29
comment How to Calculate North?
The formula for computing grid convergence depends on the projection.
Jul
28
revised After how much distance does the x,y coordinate system become noticeably distorted?
added 33 characters in body