Questions tagged [change-detection]

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

Filter by
Sorted by
Tagged with
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 ...
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 ...
1
vote
0answers
572 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
votes
1answer
492 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
votes
1answer
472 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
2answers
935 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 ...
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 ...
0
votes
3answers
542 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?
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 ...
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 ...
1
vote
3answers
1k views

How to create several header files to open AVHRR NDVI3g (GIMMS) files?

I have downloaded GIMMS NDVI3g data from http://ecocast.arc.nasa.gov/data/pub/gimms/3g/ I now need to open the files in arcgis. I have the follwing GRID PARAMETERS: grid-name: Geographic Lat/Lon ...
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 ...
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 ...
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 ...
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
votes
1answer
888 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 ...
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 ...
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? .
0
votes
1answer
474 views

Calculating percent of area changed between 2 time steps using ArcGIS Desktop

I need an image to show how many percent of area in class has been changed between 2 years For example, in output image, red is the area that has been changed 50%, blue is 35-45%, green is <35% ...
1
vote
1answer
133 views

GRASS 6.4.3 Landsat processing

what are the pre-processing steps required for landsat etm+ with GRASS 6.4.3 prior to land cover change detection? The product used is L1T.
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?
10
votes
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 ...
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 ...
9
votes
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 ...
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 ...
15
votes
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 ...
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. ...

1 2