Questions tagged [change-detection]

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

Filter by
Sorted by
Tagged with
0
votes
0answers
10 views

Image Difference in Erdas Imagine [closed]

I want to calculate change detection using Image Difference technique in Erdas Imagine in which you need to add after and before images. Is it compulsory to add the same bands for change detection? ...
1
vote
1answer
31 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
28 views

Subtract two pixels-only- layers using rectangle extent

I have coe in GEE that calcultes the NDVI in a given polygon, from 2000 (based on landsat 7) and 2019 (landsat 8) ,create for each one a layer with pixels that their NDVI value is higher than 0.3 and ...
0
votes
0answers
14 views

Creating transects using DSAS

I am doing my final year project in shoreline change detection. I completed till shoreline and baseline drawing. After that i tried to create transects through DSAS. It shows transect layer has ...
1
vote
0answers
88 views

How to perform change detection using LandTrendr in Google Earth Engine?

I am having very basic skills in LandTrendr, I want to make a map showing year of detection and another magnitude of change, but I keep getting errors. I suspect the problem to be with the image ...
0
votes
1answer
35 views

Classifying type of crop on satellite images using Python [closed]

I'm trying to make a classification on the send with python, but logically I find all the vegetation that I don't care about. The even more serious fact is that if the species is not present in a ...
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" ...
0
votes
0answers
37 views

Measuring ground displacement between two Landsat-8 scenes

I'm trying to measure the 2D horizontal ground displacement between two Landsat-8 scenes. This problem has been well addressed using sub-pixel correlation software outside of Earth Engine, so I ...
1
vote
0answers
523 views

Doing change detection of land cover between 2 landsat images in google earth engine?

I am doing land use/ land cover classification of 2000 and 2018 year . I had completed supervised classification now i wanted to do change detection analysis. Please guide me how to do change ...
0
votes
0answers
293 views

Nested loop in time series change detection in Google Earth Engine?

I want to execute Continuous Change Detection and Classification(CCDC, Zhu&Woodcock, 2014) to all pixels in a given region in GEE. The first step is to build an image collection containing all ...
1
vote
3answers
154 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 ...
0
votes
0answers
48 views

Matrix union in ArcGIS

How can I do matrix processing in ArcGIS or ERDAS Imagine? l have two different raster images for change detection. Matrix join same code filed information. In this video link already done matrix in ...
0
votes
0answers
95 views

Change detection using DEMs of difference and error quantification

Im currently working on a project in one of my seminars at university ("Advanced methods in natural hazard research"). We are modelling DEMs with Agisoft Photoscan using pictures from flume ...
0
votes
1answer
108 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 ...
1
vote
1answer
112 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
2answers
146 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 ...
1
vote
1answer
386 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(...
2
votes
1answer
182 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
509 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 ...
0
votes
1answer
94 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: ...
1
vote
0answers
118 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 ...
1
vote
1answer
112 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 ...
4
votes
1answer
367 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 ...
3
votes
0answers
56 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-...
1
vote
1answer
306 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
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
0answers
119 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 ...
2
votes
0answers
196 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 ...
1
vote
2answers
88 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 ...
2
votes
1answer
477 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 ...
1
vote
1answer
270 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
vote
0answers
131 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 ...
1
vote
2answers
101 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,...
2
votes
0answers
450 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
votes
1answer
202 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 ...
1
vote
0answers
79 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 ...
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
1answer
212 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
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 ...
4
votes
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 ...
1
vote
0answers
71 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://...
1
vote
0answers
148 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 ...
2
votes
1answer
114 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. ...
1
vote
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 ...
2
votes
2answers
488 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 ...
3
votes
1answer
367 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 ...
1
vote
0answers
77 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 ...
1
vote
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
1answer
754 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
votes
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 ...