7,589 reputation
1642
bio website
location Redlands, CA
age
visits member for 4 years, 3 months
seen 14 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.


14h
comment Covert Lat/Lot from OSG36 to Lat/Lot in WG84
@Mapperz that tool doesn't take OSGB36 lat/lon values
18h
comment Spacing a set of points
What Vince said, but because you mentioned line interpolation, do you want to thin out the vertices that make up a line or are the points scattered?
19h
reviewed Approve Run processing toolbox outside QGIS in standalone app
19h
revised How to set the QGIS display to show decimal degrees?
changed title
21h
comment GCS transformation
+1 for suggesting Campo Inchauspe. Any POSGAR realization should be within a meter or two of WGS84, not 100 meters (if GE is relatively accurate).
Jan
23
comment QGIS batch shp transform
If you have a problem getting EPSG:7405 to work (it's a compound ProjCRS + VertCRS), try using EPSG:27700 instead. That's the well-known ID for British National Grid.
Jan
22
comment QGIS (2.0.1): Field calculator for length not working - values way too high
What is the field type for QGISlength? Is it integer? If it is, what happens if you make it a double?
Jan
21
comment Mine data from QPublic
Yes, but the envisioned usage is the John Q. Public getting info about one or maybe a few parcels not hundreds. And, a scraper could overwhelm the server.
Jan
21
comment aster georeference proplem
I tried to make the question a little clearer. Did I understand it correctly?
Jan
21
revised aster georeference proplem
Tried to clean up grammar and make the problem clearer. Added tags.
Jan
20
comment Mine data from QPublic
Actually, they charge the municipalities to host and deliver the data. I clicked through to one of the sites. There's no mention about not scraping data from the site, but it still feels...wrong.
Jan
20
comment Error ET Geowizard Clean Polygon() takes no arguments (3 given)
What ArcGIS license level do you have? If you have an Advanced license, look at the Conflation toolset.
Jan
20
comment Using Odyssey.js with Cartodb.js
Please ask a new question (you can refer to this one if it's helpful, rather than asking it in an "answer." StackExchange is a Q&A site rather than a discussion or thread site. You may want to check out the Tour.
Jan
20
reviewed No Action Needed Why won't ArcMap 10 snap?
Jan
20
reviewed Approve Comparing two maps with nice web interface?
Jan
20
comment Max length for WKT name
There's some in OGC 01-009, "OpenGIS Coordinate Transformation Service Implementation Specification" (PDF). I'm not turning up the original CRS WKT spec. I can find a draft of the new std, but that doesn't really help you. Drop me a line, mkennedy at esri dot com and I'll send you some unpublished Esri doc on it.
Jan
20
comment Where to find the units for a specific spatial reference system?
btw, the canonical location for CRS definitions is the EPSG Geodetic Parameter Dataset / Registry. Disclosure: I'm a member of the group that maintains it.
Jan
20
comment Max length for WKT name
The original spec was/is at OGC. Version 2.0 is making its way through OGC and ISO. Currently, Esri's limit is 63 characters, I believe. It used to be 31.
Jan
19
comment cannot get ArcGIS to project a shapefile
It's a shapefile, so should have a .prj file. You can edit it by hand as it's a text file.
Jan
19
comment Why can't I access ArcGIS Online analysis service via Rest API?
Not a clue, sorry!