1,759 reputation
1018
bio website spatial.ucsb.edu
location Santa Barbara, CA
age 44
visits member for 4 years, 3 months
seen Jul 8 '13 at 21:27

Alan Glennon, PhD (2013) UCSB Geography. Network and spatial analytics. Twitter: @glennon Opinions are my own (not necessarily the university's)... etc. etc.


Jul
8
comment In GIScience, is there a generally agreed list of top tier conferences?
RajGovind, you might see the question: gis.stackexchange.com/questions/11502/…
Jul
2
comment In GIScience, is there a generally agreed list of top tier conferences?
Relevant to the opinion offered: I have a PhD (2013) in Geography from UCSB; my advisor was Mike Goodchild.
Jul
2
comment In GIScience, is there a generally agreed list of top tier conferences?
That is a very good calendar to follow.
Aug
29
comment How can I convert Shapefiles (SHP) to KML?
In this case, I agree with the closure. Let's take the discussion to meta.
Aug
25
comment How to use Lists with ArcGIS ModelBuilder?
I'll need to double check this when I have more time, so don't take this response as gospel... Simple copy and paste is part of the ModelBuilder list interface, but it sounds like you need to paste something a bit more complex (like a range of differing source paths). In that PowerPoint, each county name will need to be offered as a row in an ArcGIS data format (shp, table, or whatever). You'd need to direct the SQL query to examine the object. Additional info for that scripting exercise, including sample data, can be found at the author's website: users.rowan.edu/~reiser/modelbuilder
Aug
25
comment Length of forms in ArcPad10
What method did you use to create the form? I've never made one that long; in the worst case, you could use some scripting to deliver the form as consecutive smaller chunks.
Aug
23
comment Case studies of Participatory Spatial Planning
...and MarineMap is open source. code.google.com/p/marinemap
Aug
20
comment Arcgis Server vs Open Source software
Discussion of this question's closure is ongoing at meta.gis.stackexchange.com
Aug
20
comment How do I calculate curvature using GIS co-ordinates
You will need to be much more specific about your data and use case.
Aug
19
comment Arcgis Server vs Open Source software
Even as a community wiki, the question is likely to lead to arguments. +1 to close. Per the site's FAQ: "Avoid asking questions that are subjective, argumentative, or require extended discussion. This is not a discussion board, this is a place for questions that can be answered".
Aug
14
comment What are Limits on ArcScene and LiDAR?
ArcGIS 10 will run happily on 64-bit machines, but it's a combination of 32 and 64 bit components. ESRI has not updated their support sites to clarify the subtleties. I know they are working to bolster data handling for huge LIDAR datasets. Given conversations I've had with their engineers, my personal opinion is that such functionality will be delivered in the timeframe of 12-24 months.
Aug
13
comment Anybody know any WMS clients for Android?
That's the only one I know about with source.
Aug
7
comment How would I create my own geocoding web service
Inquiries about semantic similarity algorithms may have more respondents on the main stackoverflow site.
Aug
7
comment Great GIS, maps & cartography quotes
Reference for Tobler's law: Tobler W., (1970) "A computer movie simulating urban growth in the Detroit region". Economic Geography, 46(2): 234-240.
Aug
6
comment Which tools and methods can be used to create isochrones?
It might be useful to provide a little more detail about your data. Generally, if you have a set of points with a magnitude value (you may need to normalize time data so the software can treat it more easily as an attribute), do a surface interpolation and then use an isoline generator. Many GIS packages have this functionality. For example: surfaces.co.il/?p=578
Aug
6
comment What tools in Python are available for doing great circle distance + line creation?
+1 Didn't see functionality to do intermediate points along the geodesic, but very good toolset to know about (handles ellipsoid calcs). Thx.
Aug
5
comment Live KML from PostGIS to Google Earth
per poster's request, google-earth tag added.
Aug
5
comment List of Virtual Globes
A few additional notes: Wikipedia listing of virtual globes and capabilities: en.wikipedia.org/wiki/Virtual_globe KDE Marble project looks active; uses OpenStreetMap. edu.kde.org/marble
Aug
5
comment Representation of network flows
* * When flows are tightly packed, data can become more like a continuous surface. To represent such data, you can use heat maps, isolines, vector fields, etc. * * Decoupling the data from actual space will make a cartogram or graph (and these can be very elegant), but usually at the loss of geographic context. You'll need to balance your application with such trade-offs. * * The third choice is to find a way to aggregate and simplify your flows so the linear components individually still have visual meaning.
Aug
4
comment How to represent bimodal attribute value distributions on a map
Thanks for the comment. You are right. Directionality is a problem. An additional visual cue could be created (like an arrow or a thin line bordering the "fast lane"). In the end, though, and upon further reflection, I think the graded path technique probably should be applied only to the narrow use case when the network all follows the same general direction. Hope such discussion helps others.