Unanswered Questions
16
votes
0answers
265 views
What does the adoption of Python by NVIDIA for GPGPU mean for GIS?
Today NVIDIA announced support for the Python language on its flavor of GPGPU (CUDA).
Manifold GIS uses CUDA to enable some accelerated raster operations but it is not a programmable environment and ...
14
votes
0answers
333 views
Space filling between random 2D lines
Consider a region (2D) filled with lines randomly (following Figure). We are interested in filling the empty spaces between lines including four boundary edges in a way:
0- maximizing the size of ...
14
votes
1answer
724 views
How does one calculate distortion on Equirectangular Projection?
I am trying to calculate distortion so I can distort overlaying text and forms to precisely match an image of an equirectangular projection.
So, how does one calculate the distortion at a given ...
14
votes
2answers
262 views
How to do kernel density estimation with a physical barrier/ boundary in QGIS?
Does anyone know of a programme that will allow kernelling that takes a boundary into account in its calculation rather than simply masking areas that are impossible?
So far I have found:
GME add on ...
12
votes
0answers
294 views
Hyperlink tool use in ArcEngine
I'm having some difficulties using the hyperlink tool (ControlsMapHyperlinkTool) in ArcEngine. Does anyone have any experience with it?
It looks like it behaves correctly except that every time a ...
12
votes
1answer
501 views
Using “Merge Divided Roads” tool with lesser parallel lines
When using the "Merge Divided Roads" tool, it merges roads that "trend generally parallel to one another". This means that from figure one.. It will merge the beginning, where the roads are close to ...
11
votes
0answers
168 views
How can I utilize NumPy arrays to optimize big data geoprocessing?
I'm interested in learning how to utilize NumPy arrays to optimize geoprocessing. Much of my work involves "big data", where geoprocessing often takes days to accomplish certain tasks. Needless to ...
11
votes
0answers
208 views
Python Plugin Development in QGIS: How to access label text?
I'm trying to create some custom labels for point features in a QGIS point vector layer, and I want to write a python plugin to do it. We need our labels to be presented with color tinted rectangles ...
11
votes
0answers
463 views
How to Split a Concave Polygon Into Convex Polygons in Arcpy?
I'm looking for a tool or algorithm to detect concave polygons and split them into convex polygons. Like explained in the picture, the blue polygon is split into A and B polygons
I'm using Arcpy ...
11
votes
0answers
375 views
Incorporating Length of Route Value into Cost Evaluator Function (ArcGIS Network Analyst)?
A friend and I (who more frequently than I posts on this board) are creating a walking network and we have run in to a snag. We would like to attribute a cost evaluator to our network dataset using a ...
10
votes
1answer
192 views
How to Remove Dark Bands Where Scenes Overlap in Mosaic Landsat TM5 Image?
I have an image mosaic of 5 Landsat TM5 scenes. Where the scenes overlap there is a dark band, only on the left and right sides, but the top and bottom are seamless. What is the best way to correct ...
9
votes
0answers
132 views
What kind of grid spatial index does arcgis use?
My first master's research topic was about spatial indexes. I learned about R-Trees and R+-tree, R*-trees and other various but very similar topics. This may not be published information, but what ...
9
votes
0answers
409 views
ArcGIS Length and Area Calculation Scenarios
Trying to get a handle on how length and area are calculated in different scenarios in ArcGIS. I don't know why I can't find a answer on the feature class fields, but I can't find a precise answer, ...
9
votes
1answer
471 views
How to implement MultiValue Parameter with Multiple Columns?
This might be a simple question, but I haven't been able to find a straightforward answer.
I'm working on an ArcGIS (9.3) Python script. One of the inputs is a list of features. For each feature, I ...
8
votes
0answers
37 views
Assign projection to a satellite image
Today I stumbled upon a picture taken from the ISS looking down Europe and it is really beautiful.
So, I started thinking I could add more to the picture. Like world borders, cities, road network, ...
