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Questions tagged [change-detection]

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

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37 views

Finding difference between two rasters using ArcGIS Spatial Analyst?

I know how to find difference between two rasters with Spatial Analyst tools, but how to display attributes, for example differences between two Corine Land (2006 - 2012) rasters, how to see codes of ...
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1answer
27 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....
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2answers
30 views

Do I need to do Radiometric Normalization for time series analysis, if I'm using L2_Landsat8_SR data?

I'm doing some forest change detection across several years using L2_Landsat8 Surface Reflectance data. And I am implementing the method available in R (landsat::relnorm) for relative radiometric ...
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1answer
60 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(...
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1answer
80 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 ...
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1answer
131 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 ...
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1answer
63 views

Land cover change - need help with land cover classes

I'm very much new to using ArcGIS and to this forum. For my thesis, I have a raster map of Indonesia where I only look at three types of land cover retrieved from the ESA-CCI dataset. These involve: ...
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23 views

Seeking method for change detection of hurricane tracks?

I have two time period of hurricane tracks (T1 and T2). In each T, I have frequency (F) and wind (W). In short I have FOUR FILES: FT1, WT1, FT2, WT2 in geotiff. In euclidean distance, I can calculate ...
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69 views

Map algebra raster calculator

I am attempting a GIS tutorial on land change analysis between two rasters. I have set the extent and raster analysis to what I have been given and used the expression below. However, it is not ...
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1answer
88 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 ...
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1answer
252 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 ...
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139 views

r.mapcalc for change detection.

I prepared two classified raster maps of two different years using Max likelihood classification containing the same set of 4 classes each for change detection. I then used the r.mapcalc to subtract ...
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0answers
53 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-...
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1answer
216 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 ...
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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 ...
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0answers
95 views

Detecting change between 4 series times polygons (shapefiles) in R? [closed]

I have 4 series times shapefiles (my shapefiles are Polygons), my shapefiles are about urban(Urban land uses include: Agriculture,Built Up,Bare Land,Water), I want extraction change detection urban ...
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0answers
142 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 ...
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2answers
75 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 ...
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1answer
318 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 ...
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1answer
164 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 ...
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0answers
608 views

Change detection for Vegetation indices

I have 3 pairs of Landsat Images. 2 from Landsat 4-5 TM (May & June 1990, M. & J. 2000) and 1 from Landsat 8 OLI (May & June 2015). I want to calculate NDVI, SAVI, TSAVI and compare the ...
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0answers
99 views

Probabilities matrices and cellular automata in IDRISI

I apologize for asking about such elementary things, but I am utterly new to IDRISI yet am now having to learn how to perform certain tasks with it on very short notice. Am I right that, when Markov ...
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2answers
95 views

Image Classification on Photos From Camera?

I have some photos of 1X1 meter plots that were taken with a NIR digital camera. They have been georeferenced, corrected, etc. I am interested in performing an image classification for the vegetation,...
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0answers
326 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 ...
3
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1answer
166 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 ...
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0answers
76 views

salt marsh recession mapping with landsat/WV, IKONOS) [closed]

I am trying to detect timing and pattern of change in a particular salt marsh (low marsh sitting close to a high marsh). Basically, I'm interested in detecting changes in the leading edge for ...
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0answers
17 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 ...
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1answer
146 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 ...
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0answers
78 views

Calculating Change in Attributes from two different years on two overlaid maps

I am looking at comparing wetlands gains and losses along a certain area. I have downloaded maps from NLCD over multiple years and am struggling on how to compare them on ArcGIS. The two aspects that ...
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2answers
1k 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 ...
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0answers
63 views

i.spectral tool error

system description: Windows7 32 bıt OS, Grass GIS 7.0.0 Gnuplot 5.0 Solution attempt 01: On the basis of following thread, commented out said path check lines from i.spectral.py script: https://...
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0answers
141 views

How to create alluvial diagrams for land use change analysis

I have two landuse change maps and I'd like to create some alluvial diagrams to show change over time. This way I can tell what became what. Are there any tools in QGis or other GIS that can create ...
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1answer
106 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. ...
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0answers
1k views

Histogram matching of two NDVI images

I have two Landsat 5 NDVI images (Surface Reflectance products) from the same period of the year (only a few days apart), but one is from the 1980s and one from the 2000s. I am trying to do a change ...
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2answers
399 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
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1answer
313 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 ...
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0answers
71 views

Change detection between two Landsat scenes? [duplicate]

I want to do time series analysis and find change in NDVI. I have rasters where each pixel is represented by some value at a time. Also I have same thing but represented by points. And I would like ...
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1answer
93 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 ...
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1answer
592 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 ...
2
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1answer
68 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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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 ...
3
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1answer
930 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 ...
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0answers
442 views

How to handle Molusce ValueError: shape mismatch: objects cannot be broadcast to a single shape?

I have a problem in QGIS Molusce plugin. I opened two raster files represeting LULC of 2 years, and roads as a spatial variable. The result of geometry check was positive. On Area changes tab clicking ...
3
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1answer
383 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 ...
2
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1answer
264 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
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2answers
755 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
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1answer
2k 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 ...
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3answers
494 views

Automated Forest Change Detection

Using two different time of images in the same places. Can i develop an automated change detection for forest area? What / which are the suitable software to used?
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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 ...
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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 ...