Questions tagged [change-detection]

Change detection is the process of identifying changes in map content over time.

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27
votes
6answers
14k views

What is Change Detection and how I can perform such analysis with open source tools?

From wikipedia page: Change detection for GIS (geographical information systems) is a process that measures how the attributes of a particular area have changed between two or more time periods. ...
15
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1answer
2k views

How to see what lines have changed in an updated Shapefile?

I'm using my county's GIS data to update the roads in OpenStreetMap. I have a copy they published last year and one that was just published, and I'd like to find all the LineStrings that have either ...
10
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4answers
596 views

Looking for a web service for change detection

I'm looking for service that provides me a change detection service based on a database of remotely sensed data. Has anybody happen to know such a service? The service I am looking for is a geoportal ...
9
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3answers
24k views

Analyzing differences between two shapefiles to put results into new shapefile?

I have two polygon shapefiles of the same region from two different years (1985 and 1997) and I need to analyse the differences between the two shapefiles resulting in a third polygon shapefile ...
7
votes
1answer
813 views

How to produce a vegetation stress map utilizing the spectral blue shift of the red edge?

I am interested in mapping vegetation stress utilizing the blue shift to the red edge phenomenon in remote sensing. The figure below shows the expected change in reflectance of green leaves under ...
5
votes
1answer
68 views

How to store the CHANGES to a map database

I'm looking into providing a map amendment service for a particular map series. The service will help map owners look into the changes made to the operational features of the map, after the map was ...
4
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2answers
2k views

Classify forest with NDVI from Landsat 8 and 7

I'd like to calculate the NDVI for multi-date satellite images of Landsat (7,8) to perform a change detection on the deforestation of the Amazon rainforest. I already acquired surface reflectance ...
4
votes
1answer
3k views

Change detection between two classifications in QGIS?

I have two raster classifications. They have the same number of classes which use the same ID (each class has a unique ID). I would like to get information on the changes between classes i.e., class 2 ...
4
votes
1answer
3k views

How to use the same ROI for multiple LANDSAT images in ENVI?

Suppose that I have 3 landsat images with the same datum ( WGS-84 ) and projection system ( UTM, Zone 39N ) as follows: TM LANDSAT 5 image for July 1987 ETM+ LANDSAT 7 image for July 2001 OLI_TIRS ...
4
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1answer
889 views

How to do change detection between two Landsat scenes?

I want to do change detection and calculate the changes step by step using two images: the first image Landsat 1986, and the second Landsat 2000. Actually I have used image differences in ArcMap and ...
4
votes
1answer
380 views

Change Detection in ArcGIS Desktop?

I have two .las files derived from UAV photogrammetry. From there, in global mapper, I created a shapefile for each survey (one week apart), cropped to a shapefile. Brought those two shapefiles into ...
4
votes
2answers
1k views

Classification, Change detection and NDVI Using (landsat2 MSS), (landsat5 TM), (Landsat7 ETM+) and (Landsat8 OLI)

I have 5 Landsat images for the same study area. One of them in 1975 (Landsat 2 MSS), two in 1985 and 1995 (Landsat 5 TM) and one in 2005 (Landsat 7 ETM+) and the last one in 2014 (Landsat8 OLI). I ...
3
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1answer
370 views

change detction for landsat-8 and landsat-5 images

Can anyone help me in suggesting methods for change detection for landsat-8 and landsat-5 images? The software that I am using is ArcMap 10.2 and i need to find the increase in builtup area from the ...
3
votes
1answer
204 views

Land use change detection with large amount of vector files

Im doing a project where I'm creating a map that shows how land use changed from 1990-2000 for the city of Minneapolis. I have three files, one of the cities boundaries, one with the land use of the ...
3
votes
1answer
1k views

How can I create a valid probability map of species distributions based on presence/absence data from multiple quadrats?

I am somewhat new to GIS and only beginning to learn spatial statistics/analysis. I am an ecology grad student doing a before and after study on invasive plants and their responses to management ...
3
votes
1answer
493 views

WFS, python and updating

I'm trying to develop a script, something that can be run every hour/day/week etc that will look at some shapefiles (initially downloaded from a WFS) compare them to the WFS and download and append ...
3
votes
0answers
57 views

Is there an OGC standard for data synchronization?

ESRI provides two solutions that facilitate synchronization. They are Editor Tracking for Feature Services (http://server.arcgis.com/en/server/10.3/publish-services/windows/editor-tracking-for-...
2
votes
2answers
498 views

Change detection between binary rasters in QGis

I have two binary rasters, raster1 and raster2, which represent the distribution of grassland habitats inside an area in two different moments in time (raster1 = older, raster2 = recent). In both ...
2
votes
1answer
486 views

Change Detection using Raster Calculator

I'm currently analyzing the change detection for urban expansion over a decade starting from 2006-2016. How can I use raster calculator in order to know the changes? For example, from agriculture to ...
2
votes
1answer
1k views

Using Erdas for land cover land use change detection

New to Erdas but I have to do a project and I have chosen to do a landcover land change detection. I have two Landsat 5 images, five years apart from each other. What is my next step? I imagine I ...
2
votes
2answers
4k views

Change detection with raster calculator

After applying the Diff operator of the raster calculator in arcgis to view changes in land use, would like to see the areas of increased and areas of decreased. This is possible using the raster ...
2
votes
2answers
6k views

Can Arcmap 10 do change detection?

I have an assignment to find out changed areas of the two different layers ( let's say 2000 and 2010).the layers are vector. Is it possible to detect the changed areas by using Arcgis?
2
votes
1answer
70 views

Sequential rasters - when did point x change

Using ArcGIS 10.1 with Spatial and 3D Analysts, and Python 2.7 I have a series of reclassified rasters in which every cell is either one or zero. I need to programmatically create a single raster ...
2
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2answers
936 views

Calculating gain and loss area of vegetation land from two lines representing different years using ArcGIS for Desktop?

How can I calculate a gain and loss area of vegetation land having two different lines that represents vegetation in different years. Edit: There are two polylines, one represents the edge of ...
2
votes
2answers
2k views

Classification, change detection and NDVI using landsat 2 (MSS), landsat 5 (TM) and Landsat 7 (ETM)

I have 3 Landsat images for the same area. One in 1972 (landsat 2 mss), one in 1996 (landsat 5 TM) and one in 2010 (landsat 7 ETM). I would like to detect changes in land cover and create diachronic ...
2
votes
1answer
42 views

How to identify landuse change with Sentinel data - specifically grassland/woodland to arable cropland changes

I have an assignment to assess whether it is viable to use sentinel data to monitor illegal changes of landuse from Grassland/Woodland to arable cropland. This is the first time my environmental ...
2
votes
1answer
206 views

Comparing current image in collection to previous image in collection using Google Earth Engine

I am wanting to subtract one binary raster from another, for all images in a collection. For example if I have ten images, I want to subtract image 2 from image 1, image 3 from image 2, image 4 from ...
2
votes
1answer
563 views

Temporal segmentation algorithms using Google Earth Engine

I'm using the temporal segmentation algorithm Vegetation Regeneration and Disturbance Estimates - Verdet - for land cover change detection. The output layer is created but I can't display or export it ...
2
votes
1answer
115 views

What are the most effective methods for monitoring changes in polygon layers over time

I work with many different thematic areas with GIS but there is one underlying task which as yet has never been satisfactorily methodized. This is how to effectively monitor changes over time. ...
2
votes
1answer
477 views

Detecting geometry change between two line layers in QGIS

Looking to find a method of simply detecting if the geometry between two layers (line) has been altered. I have two layers of the exact same features but I suspect there is a difference in some of ...
2
votes
1answer
116 views

Generate a matrix of change from shoreline vector time-series data

I have shoreline vector data that corresponds to property ownership, and time series data referring to attributes such as erosion levels, shoreline class (ornamental, natural, regenerative), etc. At ...
2
votes
0answers
199 views

Change Detection using Vector files [closed]

I have two shapefiles showing LULC of the same area for two different years; 1990 and 2015. Number of Polygons in two files are different but the number of class in both are same. Is there any way ...
2
votes
0answers
462 views

Raster Calculator and Land Change with multiple classifications

I am looking at land cover data that is separated into three classes: upland, wetland, and open water. I have the data for varying years. I am interested in seeing how the land has changed over the ...
2
votes
0answers
18 views

Change management of aerial photos of same fields

I am looking for an automated solution with capable to stitch aerial photographs and the result can be integrated into Google Maps. Furthermore it has an ability to show discrepancies on a new layer ...
1
vote
2answers
89 views

Population Change [closed]

I don't know if this site does general human geography, but since it's the only geography site I found this is the question. Population change takes into account 'growth rate' (which includes births ...
1
vote
3answers
163 views

Bare Soil Detection

I try to find bare soil areas. Those which are bare over the whole year and those which are fresh harvest and remain bare over a certain time. I try to do this with sentinel-2 data. But the Problem is ...
1
vote
1answer
1k views

How to calculate forest loss in google earth engine

I am using the method outlined in a previous question - Extracting land cover type in Google Earth Engine? - to identify habitat type and area with a defined polygon. I would now like to take this ...
1
vote
1answer
218 views

Find most recent update in WMS or WFS

We want to periodically poll various WMS or WFS services and do something if the source data has changed. Is there any way to do any of the following: find the date of the most recent update to a ...
1
vote
3answers
611 views

OSM Display a particular changeset-version of a way

Is it possible to visualize an particular changeset of an way? It's about this way: http://www.openstreetmap.org/way/24837452 At the moment it seems to be a part of an MultiPolygon, but in the past ...
1
vote
1answer
404 views

Calculate difference of subsequent images in a collection

how do I call a Specific Image inside a Collection, to loop over it? this is for calculating the difference of images for each set of two subsequent images in a collection dImage= Image(t=i+1)-Image(...
1
vote
1answer
310 views

QGIS/SAGA Cross-tabulation error

I'm new to QGIS after using ESRI/ENVI/ERDAS products for years. I am trying calculate a cross-tabulated change image for post-classification change detection. After figuring out how to fix a ...
1
vote
1answer
279 views

DetectFeatureChanges_management gives out error 000366 “Invalid geometry type”

I am trying to compare county borders in two shapefiles and create a third showing how (if at all) those borders changed. To do so, I'm using arcpy.DetectFeatureChanges_management. I have tried the ...
1
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1answer
97 views

Land cover modifications in different time periods

I have several shapefiles which contain buildings built in different periods from 1948 to 2013. My question is how could I see which buildings for example in were built 1948 but are missing in later ...
1
vote
2answers
4k views

Doing change detection in ERDAS

I want to obtain the size of unchanged, decreased, and increased area etc (just like shown in image below) from 2 classification images in 2000 and 2007. How do I do this in ERDAS? .
1
vote
1answer
33 views

Comparing between two polygon class values

I have one polygon shapefile with two fields that I would like to detect their difference. the fields have the same class values: between 0-4: This is the first layer: and this is the second: I ...
1
vote
1answer
46 views

Change detection between two binary images

Is there a scientifically-valid to use raster calculator to subtract two binary images (0, 1) to get the difference between Pre- and Post flood events? In pseudo-code: Difference "change detection" ...
1
vote
1answer
125 views

Estimating building and vegetation volume with unclassified LiDAR datasets?

I'm trying to determine the ratio of building to vegetation change (i.e. how has the volume of built structures changed in proportion to the volume of vegetation) in a city over a period of five years....
1
vote
1answer
113 views

Performing tag change detection in OpenStreetMap?

I'd like to have a tool for monitoring changes in OpenStreetMap (OSM) for tags only, not geometry. For instance, I'm interested in detecting any tag changes regarding one-ways in streets. This can be ...
1
vote
1answer
768 views

Creating raster depicting landcover/use change in ArcMap?

How would I create a conversion matrix in ArcMap 10.2.2 to display the changes between two rasters (Land Use Land Cover Maps)? I have produced Land Use Cover Change maps from temporal satellite ...
1
vote
1answer
1k views

How to get “p value” for time series data to detect significant change

I have yearly maximum NDVI data (1982-2008) and extracted all value to Excel. Also calculated slope value for each point during the 27 years. All of you know the slope value represents changes per ...