The act of comparing or the process of being compared.

learn more… | top users | synonyms

2
votes
0answers
389 views

ArcGIS/arcpy: Geometry object comparison methods not working. Do they take z values into account?

I have an arcpy script that makes calculations based on an input PolygonZ feature class. What I need to do in several places in the script is test whether a point falls within a polygon in 2D. In ...
2
votes
1answer
149 views

Compare workspace schemas in Modelbuilder

My model has two model parameters: A file gdb workspace or sde workspace containing the data An empty "template" file gdb As the very first process in my model, I want to check if the schema of ...
4
votes
1answer
3k views

How to compare 2000 Census block group data with 2010 block group data?

I want to calculate the percent change for median household income in Los Angeles at the block group level from 2000 to 2010. Someone told me I have to reaggregate 2000 block data to 2010 block group ...
5
votes
3answers
516 views

In what data format should I export a (lat,long,alt) or (x,y,z) grid to be compatible with the largest number of GIS software?

I am new to GIS and developing an application that generates a 3D grid with (latitude, longitude, elevation) or (x, y, z) metric triplets, and I would like to add an exporting feature that ensures ...
10
votes
1answer
548 views

Looking for a trajectory similarity measure

For my final academic work I have developed a compression algorithm for GPS trajectories. I can estimate the quality of the spatio-temporal compression by computing the syncronized euclidean distance (...
9
votes
5answers
17k views

Comparison of Open Source Desktop GIS Packages

I'm curious as to what comparisons are out there between different Open Source Desktop GIS software packages. I'm aware that there has been a QGIS and gvSIG comparison on this site but I am looking ...
1
vote
0answers
316 views

Manifold 'Link drawing to query' - can I do this in QGIS?

Manifold GIS allows the creation of dynamic drawings linked to queries. Unfortunately I do not have access to Manifold as my employer refuses to pay for it, so am currently investigating alternatives....
6
votes
4answers
1k views

Basic .NET mapping components?

Which .NET mapping components are currently available? Focus is on desktop use and fairly basic mapping of SHP files (thematics etc.), not the more advanced GIS functionality (reprojections, clipping, ...
8
votes
2answers
2k views

What are the pros and cons of using the ArcGIS Viewer for Flex vs. creating your own GIS application vs creating your own framework?

Simple question, but perhaps hard to answer. I have broken the title question into three distinct questions in order to clearly identify what we are considering for options each time we build an GIS ...
7
votes
2answers
1k views

PostGIS feature compare function?

I would like to be able to compare features in Layer 1 (source) to features in Layer 2 (updates to source) in order to see if any of the features geometry and/or attributes have changed. I would also ...
7
votes
4answers
688 views

Comparing 2 vector files

I'm looking for a tool which compares two vector files (eg shapefiles). Eg 2 versions of a river network. Quite a lot of the records are equal, but some are different. A possible output would be eg a ...