The process of extracting geographic, statistical, geometric, or scientific information from one or more related collections of GIS features and data.
3
votes
2answers
67 views
How to computational efficiently check if there are any overlapping polygons in a group of polygons?
I need to do some processing with groups of polygons. If any of the polygons in the group overlaps other polygon the result is unpredictable and don't throw any error. So, I need to detect if there is ...
0
votes
2answers
58 views
Find and list all polygons that overlap with another polygon
I am working with two polygon layers which overlap but are unrelated (one is congressional district boundaries, the other is MPO area boundaries).
I would like to generate a list of all the ...
1
vote
1answer
92 views
ArcMap 10.1 Spatial Join: 'Contains' and 'Within' question
I have two polygon datasets: electoral districts and postal code areas. I'm performing a spatial join to see which postal code areas are completely within a district (the area can touch the borders, ...
0
votes
1answer
32 views
Nearest neighbor analysis not showing results
I'm trying to do a nearest neighbour analysis on fish shoals distribution.
I go to Vector > Analysis Tools > Nearest neighbour analysis. I choose the appropriate layer and when I hit ok the black ...
0
votes
1answer
44 views
Calculating sinuosity of a path with GME in ArcGIS 10?
Does anyone have any experience with pathmetrics in GME?
I would ideally like to use the old Hawths's tool "line metrics" for calculating sinuosity of a daily path but I have ArcGIS 10. I downloaded ...
4
votes
0answers
48 views
Point and Line Statistical Analysis
I have just lost the past 8 hours on this, and literally getting nowhere - hoping someone can help before I go mad!
I am trying to determine the correlation between sinkholes and a number of ...
3
votes
0answers
325 views
Performing a Multicriteria Analysis Using Distance Along a Road Network
There is the possibility that I will be working on a project which will look at thousands of properties in a region and measure their accessibility to different services (schools, parks, hospitals, ...
2
votes
0answers
128 views
How do I create a leader line for a label in my bar graph in ArcMap?
I am displaying a bar graph of various tornado watches and warnings along with the actual tornado touchdowns themselves. Since the tornado touchdowns are such a small number compared to the large ...
2
votes
0answers
198 views
How to create a service area using both streets and buslines in the same network?
Hello,
I want to create a network analysis more difficult. Therefore, I want to calculate a Service Area around hospitals next to busstops. But: The network does not only consist of roads and ...
1
vote
0answers
78 views
How to relate Slope map and Curvature map so as to have in the end PERCENTAGE PROBABILITY MAP?
i am trying to deal with road detection this last month. So i am working with particle filtering that produces particles, that means possible targets(to my case cars)/points, with hidden information ...
1
vote
0answers
148 views
mean coordinates in qGIS
I am using qGIS v 1.7.4 for MAC and trying to calculate mean coordinates for a set of points using ftools.
To calculate my result I am going to Vector -> Analysis tools -> mean coordinates and ...
1
vote
0answers
84 views
how to set in arcgis network analysis that use every road segment max m times?
excuse me if my english ins't good. I have one incident and 120 facility. i wanna set criteria in Arcgis network analysis that if any road segment used for example m times, for other route doesn't use ...
0
votes
0answers
32 views
How to add attribute from analysis to database mySQL?
I need to prepare a GIS for a customer. They insist to use a MySQL-Database (not the best option, I know). They need to digitize some geometries (areas) and add some attributes. The geometries and ...
0
votes
0answers
34 views
3D tool for a visual analysis
Given a 3D mesh I need to visualize and analyze properties and elements generated from the object such as:
tensors
coplanar/similar elements ( coplanar faces, aligned vertices, etc etc, 3D geometry ...
0
votes
0answers
389 views
Sextane script error (os is not defined)
I want to build an analysis script using Sextante 1.0.9 on QGIS 1.8.0. I find an example script in Youtube. I tried this code but never worked always getting error. People say that Sextante is ...
0
votes
0answers
48 views
Interpretation of MODIS VCF Data, concerning walking distance analysis
I'm still working on my diploma thesis (must be one of the last ones in germany..;)) which deals with distance analysis. I want to model walking distances and cost paths affected by slope, vegetation, ...
0
votes
0answers
95 views
Where can one find GIS shapefiles for all of California's municipal jurisdictions (cities, counties, special districts, JPA, CFDs, etc.)?Edit
Cities and counties are easy but I've been digging a while for the other information and haven't had any luck. Particularly interested in water districts and some of the more major JPAs -- for ...
