Questions tagged [comparison]

The act of comparing or the process of being compared.

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2answers
2k views

Comparing layers in QGIS and finding overlay?s

I'm a newbie to QGIS. I have run into a thing I can not solve despite trying to search for a solution and working through the functions in the tool. I have two layers I want to compare. One is filled ...
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3answers
2k 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 ...
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1answer
28 views

Selecting Different points in 2 different layers

I'd like to make an analysis on points. I've 2 layers they have house numbers as an attribute. What i'd like to do is compare these 2 layers and select the different ones. Geometrically there are ...
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1answer
115 views

Comparing a list from an arcpy search cursor to a list from a CSV file

I'm attempting to compare entries in a CSV file to entries in a geodatabase using a search cursor through arcpy. I'm not sure if this is the best way to go about a comparison against these two ...
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1answer
2k views

Advantages of OSM over Google Maps for custom map in app

I wanted to map my city on a private map. I have read about maps and I found that I will need tiles. Looking at available service, could not find one that allows me to host them in my server. Which ...
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1answer
60 views

Quantifying polygon changes between shape layers in ArcGIS?

I have a map with two shape layers from different years, which are made up of habitat polygons, and are the same shape other than changes to the areas of these habitats. How do I get a table of the ...
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1answer
108 views

comparing raster values over one specific transect

I have a raster with water temperature data. I used various kinds of filters over it (smoothing, sharpening filter etc.) in various combination. I want to compare the results, to check which ...
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1answer
149 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 ...
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0answers
29 views

Merge partial (or entire) geographical paths [closed]

I have data of a vehicle route and some data already inserted in the system. I have to find the parts of the route that are already presents in the system in order to avoid duplicate the info. The ...
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0answers
52 views

Comparing yearly changes in TaxLot land use in NYC (mapPLUTO) - tax lots change through time

I am trying to build a database for NYC in which, for specific boroughs of the city, I track changes per tax lot unit in terms of land use and other attributes, both qualitative and quantitative. For ...
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0answers
29 views

Light normalization of Orthophotos to increase comparability

I would like to work with the RGB-values of different orthophotos. Now I noticed that the light conditions are not the same in the different orthophotos. I was wondering if there is a sound way to ...
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0answers
26 views

Methods to differentiate between terrain

I am not specialized in GIS. I have some moisture contour maps, I want to compare each pair to trace the changes between either in a numeric way. I tried to get the mathematical difference between ...
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0answers
389 views

Compare a DEM and DSM with QGIS

I have a DTM with 40cm resolution and a DSM with 2cm. Now I would like to compare the two so I can identify vegetation that is higher than a certain distance from the ground. I changed the pixel size ...
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0answers
41 views

Compare symbols in pyqgis

I'm working with renderers and I want to compare symbols from two different renderers. Is there any way to do it in pyqgis/python? Here is how I get symbols: renderer = layer.rendererV2() category = ...
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0answers
86 views

Tool, API of or code samples for calculating spatial similarity between Lines

I am migrating a database with a road network to an other external data provider. We have joined our own data about roadworks, temporary speed-limits, etc., using ID and linear referencing on this ...
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0answers
363 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....
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4answers
765 views

Searching for changes of 2 layers based on geometry, Arcgis for desktop (ArcEditor

I´m trying to make a tool that would be able to compare 2 layers of any type (polygon, point, polyline) and find differences between them. Lets say i have a layer of roads (Polyline) from 2005 (layer ...
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2answers
781 views

Using IN filters in OpenLayers?

Is there a way to use IN filters (like the IN operator from SQL) in OpenLayers 2? For example, let's say, I want a filter like this: city = 'Paris' OR city = 'London' OR city = 'Lisbon' In ...
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2answers
114 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 ...
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1answer
108 views

Vector maps comparison (looking for a Kappa-like index for vectors) in R?

I am currently trying to compare two shapefiles (representing buildings) in order to validate simulation results. One shapefile contains real data and the other is the product of an urban simulation ...
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1answer
318 views

chi-squared for two rasters in R

I am kind of new with statistics. I have two raster with categorical values and I want to get chi-square. How can I do this using R? Rasters have the same region and same resolution. Is chi-square ...
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1answer
88 views

Road network comparisons - how to extract roads that do not completely fall within the buffer

I am trying to compare how well one road network aligns with another - I have created a buffer around the first network and would like to select only the roads from the second network that fall ...
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1answer
134 views

Comparing routes [closed]

I am looking for a way to compare routes of two 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 ...
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1answer
149 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 ...
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0answers
31 views

Comparing Multiple Shapefiles

I have 4 shapefiles that I need to compare spatially, to highlight inconsistencies between them in ArcGIS. I have used the Feature Compare tool so far, but I'm looking for a faster way to compare the ...
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0answers
26 views

Visualizing two different datasets amicably when they are measuring two different things

I am working on a story map in AGOL that is comparing the percentage of a population that lives in a house that has been deemed transit dependent versus the concentration of a population that lives in ...
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0answers
65 views

ArcPy FeatureCompare vs. FileCmp

I have a huge number of shape files that I receive on a recurring basis. I want to be able to compare the new version to the current version, and then only update the db with those that are different. ...
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1answer
2k views

How to compare two feature classes on one field?

I have two feature classes: an old one and a new one that I want to compare. Both feature classes have the same field structure and have a reference field 'ID' whose values are the same, except in ...
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1answer
345 views

What is the most size-efficient spatial file format for vector polygon data? [closed]

Surprised I couldn't find an answer to this on Google. For transferring a complete dataset (polygons, in vector form) in a single file, what is the most size-efficient file format?
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2answers
76 views

Can I change the pimary key for feature class comparisons with ArcPy

I'm using ArcPy to compare two feature classes from Esri file geodatabases using the Feature Compare (Data Management) tool. The script itself works very well. However it always uses the OBJECTID to ...