Tagged Questions

The act of comparing or the process of being compared.

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4
votes
0answers
31 views

how to compare geometries (contains, within) in arcpy?

I am trying to use 2 geometry objects to check if a line is within a (rather complex) polygon. The geometry check always fails, even if the line is clearly within the polygon. I use the following ...
3
votes
2answers
126 views

Python code to compare two fields in different feature layers?

I have two shapefiles which encompass 3897 features each. Corresponding shapefiles (village and watershed that flows into it) have the same ID (ws_id in one, OBJECTID in the other). Many watersheds ...
1
vote
1answer
47 views

How to compare polylines attribute from the same GRID cell in ArcGIS 10?

I need some help because I do not know how to model this issue: I have two polyline shapefiles. They have an attribute that I need to be compared. These are roads from different sources. So, I have ...
5
votes
3answers
108 views

Calculation based on features in shapefile

I hope I get the terminilogy right! Correct me if I mess something up. I need to perform some calculations for a scoring system for different habitat types. The Problem is that I have two different ...
0
votes
0answers
17 views

Trajectory comparison

I have mean-variance plots of NDVI over time for different data sets. How would I go about comparing the trajectories of these plots?
0
votes
1answer
40 views

Comparing routes

I am looking for a way to compare routes of 2 or more persons to be taken by car. Person 1 has a starting point A1 and a destination point A2. Person 2 has a starting point B1 and a destination ...
0
votes
1answer
108 views

How to use “this” Levenshtein Python code into ArcGIS 10

I need some help with this: First of all, I wanted to "Compare strings from two fields", and asking before at gis.stackexchange, in this post someone help me with this topic, referring me to a Python ...
2
votes
1answer
316 views

How to compare string fields in the same table with ArcGIS 10

I don't know exactly if there is a tool for this or a maybe a python script could be more suitable. I want to compare string elements from a field (POI_NAME) with another string element in another ...
1
vote
4answers
113 views

Looking for simple software to compare two Landsat Images

At uni I used ERDAS imagine to view two rasters at the same time and it had various viewers for comparing them. I'm looking for something that has a slider so that I can see the differences between ...
1
vote
1answer
191 views

Bentley Microstation in comparison to ESRI ArcMap : Filetypes and Capabilities

I'm curious if there is a side-by-side comparison of Bentley's Microstation v8i (Select series 3) with ESRI's ArcMap 10.1 showing capabilities and filetype acceptance. I have heard some conversations ...
5
votes
3answers
104 views

What is the PostGIS 2.x equivalent of the pre-PostGIS 1.5 ~= operator?

Stemming from my other question: When would a PostGIS geometry compare using ~= return true when ST_Equals returns false?, what is the PostGIS 2.x equivalent of the pre-PostGIS 1.5 ~= operator? It ...
2
votes
1answer
86 views

When would a PostGIS geometry compare using ~= return true when ST_Equals returns false?

I have a couple of featureclasses in a 10.2 geodatabase/PostgreSQL 9.2.2 database and I've been struggling with the FeatureCompare tool--it is telling me geometries are different on some features ...
8
votes
4answers
1k views

What python web-mapping framework to use?

I am interested in developing a web-mapping application. I am relatively familiar with Python and so i'm looking for a python framework. What are my options? what are the pros and cons of each option? ...
1
vote
1answer
61 views

resampled thematic map accuracy

I've generated a map of ecoregions based on some environmental data using a semi-supervised classification where I combined a statistical clustering with random forests to generate my map. I created ...
2
votes
0answers
65 views

How easily can you pick up ArcGIS for Desktop if currently learning through QGIS on a Mac? [closed]

I'm currently trying to teach myself GIS and I have some really basic questions. I apologize if this has already been asked, but I have yet to find an answer to my question. So since I use a mac and ...
2
votes
0answers
29 views

How successful are current metadata implementations in achieving its objectives

Metadata infrastructure is well established as an essential practice within the GIS community. Quoting from the FGDC: Metadata helps people who use geospatial data find the data they need and ...
1
vote
0answers
169 views

How to compare files in two folders? [closed]

I'm pretty new user of ArcGIS. My intention is compare files (csv) from one folder with files in another folders. In those folders exist files with the same name but in second folder files have ...
5
votes
2answers
152 views

Different models, different contours: are they comparable?

I will get contour lines of electromagnetic field strength around power lines. The contours will be calculated by different agencies using different models. We need to check whether the resulting ...
2
votes
1answer
153 views

Easiest way to find spatial differences between Polyline shapefiles

I run into this problem a lot. I have two polyline's and I need to test for Spatial differences in them. Usually I use Erase and I have my answer, but on this PC I now only have access to ArcGIS Basic ...
4
votes
3answers
248 views

Comparing choropleth maps statistically

I have several sets of choropleth maps showing ranges of poverty by census tract, each using a different poverty measure. All of the maps use the same categorical ranges to define poverty status. The ...
0
votes
1answer
97 views

Comparing ShapeFile Data in C# [closed]

I have made a List containing all the original data (.shp files), and I have another List containing the modified data. I basically want to check all the modified file data against the original... So ...
0
votes
3answers
2k views

How to compare differences in two shapefiles? [duplicate]

I am a new user to Arcmap 10. I've been trying to figure out how to compare two polygon shapefiles. I need to figure out what the difference is from 2007 - 2013 (increase/decrease) in a couple of ...
2
votes
1answer
326 views

Compare two Digital Elevation Model (DEM)

I would like to know what's the best method(s) to compare two DEMs without using any GUI soft like QGIS or ArcGIS. I'd like to do it in Python or C++, with GDAL or other similar lib. Does calculating ...
7
votes
1answer
453 views

Comparison of three contour lines

I am looking for a way to spatially quantify the difference between three contour line shapefiles. More specifically, I have two elevation rasters which I intend to create contour lines from, but ...
8
votes
2answers
217 views

How to efficiently (programmatically) determine whether two datasets have / don't have identical content?

Given: a geodatabase A that contains 100 datasets named a1 .. a100 a geodatabase B that contains 100 datasets named b1 .. b100 I want to programmatically (*) determine for each dataset pair (ai, ...
4
votes
1answer
93 views

Is there a tool to compare ArcGIS Desktop configuration on two pieces of hardware?

I have two PCS with ostensibly the same configuration (i.e. both ArcGIS Desktop 10.0 SP5, both 4Gb RAM) yet when I load the same file geodatabase onto both and run the same large (400 element) model ...
9
votes
2answers
243 views

Tools to compare unversioned copies of geospatial data

My office has about 100 GB of geospatial data of varying forms (imagery, feature classes in geodatabases, LIDAR, tables, etc) that have gone somewhat unmanaged for the decade during which they were ...
0
votes
0answers
293 views

What is difference between Geo BI (Geo-business Intelligence) and GIS (Geographic Information System)?

I tried finding information with difference between Geo Business Intelligence and Geo IS but unfortunately no clearly answer being found. What is different between Geo BI and GIS and its ...
0
votes
2answers
105 views

I am looking for a list of mapping libraries? [closed]

I am looking for the top APIs that I can use to display maps from a number of map servers/sources. (like openlayers and openscales). So are there any other popular APIs for other languages than ...
3
votes
1answer
602 views

Does MySQL only support bounding boxes calculations instead of the real polygon geometry?

Within our company we are deciding which DBMS we will use to store spatial data. IT wants MySQL with the Spatial extension because there is already knowledge about handling MySQL DB. We are doing ...
5
votes
1answer
518 views

What is the Market share for open source web-GIS systems?

I would like to know the market share of 3 web-GIS systems, deegree, GeoServer, Geomajas). Which one is more popular? Are there any evaluations regarding the market share of open source web-GIS ...
5
votes
0answers
329 views

Can Quantum GIS replace Proprietary GIS? [closed]

I’m an MSc GIS student in the final year of my studies. I’m researching for my dissertation project which is entitled ‘Can Quantum GIS replace Proprietary GIS in large organisations?’ I’m primarily ...
-4
votes
1answer
357 views

Looking for a user-friendliness & functionality comparison for ArcGIS and QGIS

what is a user-friendly (ease of use) and functionality comparison for ArcGIS and QGIS? derived from Which topics are fundamental for ArcGIS? QGIS and gvSIG comparison
1
vote
0answers
296 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
130 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 ...
3
votes
1answer
2k 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
371 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
274 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 ...
7
votes
5answers
9k 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
237 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 ...
0
votes
1answer
190 views

Is the Heatmap Colorramp uniform across different rasters for ArcGIS?

SO i have about 16 rasters spanning the same extent and containing the same variable. I use the display symbology in ArcGIS to generate a stretched Color Ramp which is the heatmap i want. As the ...
6
votes
2answers
873 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 ...
6
votes
2answers
981 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
516 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 ...