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Questions tagged [comparison]

The act of comparing or the process of being compared.

3
votes
1answer
85 views

QGIS: Select point(s) in other layer with similar datetime value from selection

For the interpretation of bird observations, I need to identify the position on a GPS-track (gpx-files), from which the position of a bird observation (other gpx-waypoint layer) was recorded. The ...
3
votes
0answers
37 views

QGIS vs gvSIG: Update for 2019 [duplicate]

There were two posts from back in 2011 about the advantages of gvSIG and comparing QGIS and gvSIG. It's been 8 years since and I'm wondering if there might be an update since gvSIG and QGIS (at time ...
0
votes
0answers
30 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 ...
1
vote
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 ...
2
votes
2answers
126 views

How to make two side by side maps match up in layout view in MapInfo?

I am working with two maps that have different thematic elements on each- in this case, I made two different columns to display the concentration of chemical found on that location. I display the ...
1
vote
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 ...
1
vote
0answers
51 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 ...
1
vote
1answer
112 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 ...
0
votes
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 ...
0
votes
4answers
747 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 ...
1
vote
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 ...
5
votes
1answer
191 views

Difference between OSM regional extracts unexpectedly large

I want to create a difference (change file) between two Europe extracts from OSM data. The files I want to compare are: http://download.geofabrik.de/europe-180401.osm.pbf http://download.geofabrik.de/...
3
votes
2answers
854 views

How can a statistically significant difference between rasters be calculated?

so after some gruelling use of MaxEnt I have four occurrence probability rasters for the four quarters of the year, each one is about 70MB+. I want to test whether they are significantly different ...
1
vote
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 ...
1
vote
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 ...
1
vote
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 ...
0
votes
2answers
770 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 ...
7
votes
1answer
92 views

Why does 3d Bounding Box &&& check return true when I use ST_3DMakeBox?

I'm just wondering why this &&& is returning true when I use ST_3DMakeBox? SELECT ST_MakePoint(0,0,0) &&& ST_3DMakeBox( ST_MakePoint(-1,-1,-1), ST_MakePoint(1,1,-1) ); ...
0
votes
1answer
130 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 ...
1
vote
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 ...
1
vote
3answers
22k views

Comparing differences in two polygon shapefiles using ArcGIS Desktop? [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
585 views

Segment matching on a polyline

I have about 1000+ running routes which I can load into memory as polylines using latitude and longitude data captured from a running watch. From these polylines I would like to be able to identify ...
7
votes
0answers
690 views

Landsat level-2 data comparison

I'm doing a temporal analysis of NDVI and temperature over 17 years, necessitating data from Landsat 5,7, & 8. I'm interested in using level-2 Landsat data available from https://espa.cr.usgs.gov/...
-1
votes
1answer
327 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?
1
vote
1answer
59 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 ...
1
vote
1answer
106 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 ...
9
votes
2answers
575 views

Tools to compare unversioned copies of geospatial data [closed]

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 ...
4
votes
1answer
895 views

comparison of Historical aerial photographs to today's satellite images

I'm working on a project in which I have to compare vegetation cover changes. So we have 1950's aerial photographs which must be compared to actual satellite images. Images must be properly adapted ...
0
votes
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. ...
3
votes
2answers
4k 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 ...
0
votes
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 ...
2
votes
1answer
585 views

How to compare a TIN and IDW-derived raster DEM quantitatively?

I'm a student and got the assignment to compare a TIN with a height raster 'quantitatively' and I'm not quite sure how to proceed. I tried subtracting the one from the other but it doesn't seem to be ...
3
votes
1answer
147 views

Appropriate Japan US comparison map

I would like to create a map in QGIS comparing the relative size and latitudes of Japan to the US. There are a few websites like mapfrappe which allow this using Google Maps, but I would like to be ...
7
votes
2answers
229 views

How to check what changed inside the updated shapefile?

I am using different shapefiles from open data in Switzerland. They have just updated the whole set. My question is: how to compared two layers (new and old version)? I would like to know the ...
1
vote
0answers
383 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 ...
4
votes
1answer
517 views

How to compare a classified raster dataset to another polygon dataset?

I am going to perform an unsupervised classification on my dataset and will get a map as a result. The objective is to rebuild an already existing map (of different soil types) with my new dataset. ...
1
vote
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 = ...
1
vote
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 ...
2
votes
0answers
46 views

Comparing multiple polyline shapefiles to single key file [closed]

I am working on a project where we are comparing participants' spatial memories. We take them through a circuit, then later in the lab they draw the route they traveled. I want to be able to compare ...
10
votes
1answer
4k views

Identifying overlapping time intervals with two more criteria in R?

I have to check birds observations made over a longer period for duplicate/overlapping entries. Observers from different points (A,B,C) made observations and marked them on paper maps. Those lines ...
8
votes
3answers
446 views

Efficient processing of difference between input data and database

I have an input dataset whose records will be appended to an existing database. Prior to being appended, the data will go through heavy, time-intensive processing. I want to filter out records from ...
5
votes
1answer
1k 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 ...
2
votes
0answers
91 views

Can 2 GIS layers which representing the same area be compared directly while having the same datum but different coordinate system?

My question is about how coordinate systems affect comparison of different layers - I have tried to refresh my memory about coordinate systems in GIS, but am still unsure about this situation. I am ...
-1
votes
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 ...
2
votes
1answer
587 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 ...
6
votes
4answers
2k 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, ...
2
votes
1answer
32 views

How to compare a 'predicted' layer with an 'actual' layer for the same study extent?

I have developed a vector layer which predicts which polygons are more or less likely to experience coral bleaching. I now have another vector layer with the same extent with actual coral bleaching ...
0
votes
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 ...
5
votes
0answers
1k views

Python vs R for analzing spatial data [closed]

I am relatively new to both the python and R programming languages, having a small amount of exposure to both. Which language has the edge when working with spatial data and when would you use R over ...
1
vote
0answers
85 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 ...