topic Re: please help me with land cover change detection with ArcGIS 10.1 in ArcGIS Spatial Analyst Questions

please help me with land cover change detection with ArcGIS 10.1

AnTruong — Mon, 24 Jun 2013 02:03:19 GMT

Hello everyone,

I am finding a way to detect land cover change with ArcGIS 10.1. I have googled alot, but most of the answer was with ArcGIS of older version. And I completely new to GIS, then I could not find a relevant tool in ArcGIS 10.

I already have the maps of land cover (MODIS MCD12Q1) from 2001 to 2011 of the area of interest.

Please kindly instruct me, how I can detect land cover change between these years.

Thank you very much.

with regards,

Ann

Re: please help me with land cover change detection with ArcGIS 10.1

curtvprice — Mon, 24 Jun 2013 16:31:39 GMT

I am finding a way to detect land cover change with ArcGIS 10.1. [...] I already have the maps of land cover (MODIS MCD12Q1) from 2001 to 2011 of the area of interest

If you have Spatial Analyst, the Combine tool will overlay two or more rasters. The output raster's value table includes the values of each unique cell value combination that occurred.

Re: please help me with land cover change detection with ArcGIS 10.1

DanLee — Fri, 28 Jun 2013 20:50:16 GMT

Hi Ann,

Are you working with vector data? Would you be able to share some sample data? You may need to provide more details so that people can make the right suggestions. Thansk.

Re: please help me with land cover change detection with ArcGIS 10.1

curtvprice — Sat, 29 Jun 2013 03:12:37 GMT

Are you working with vector data?

Dan, MCD12Q1 is a 500m global raster land cover dataset. (Kind of an awesome dataset IMHO!)

Land Cover Type Yearly L3 Global 500 m SIN Grid

Re: please help me with land cover change detection with ArcGIS 10.1

DanLee — Sat, 29 Jun 2013 04:25:41 GMT

Thanks for the info and the link. If the raster tool solves the problem, then there is no need to think vector; i war just curious.

Re: please help me with land cover change detection with ArcGIS 10.1

CarlyEasby — Wed, 08 Jan 2014 12:31:38 GMT

Hi I am working on a similar project. I am trying to compare land cover in the UK in 2000 and 2007. I have a .asc file for each year with 10 habitat classes. I want to use combine in the spatial analyst toolbox but my issue is that the value field in the attribute tables varies slightly i.e some of the same habitats have been assigned different values in each year. I can find no way of editing the values. Any ideas how I can get round this?

I am operating on 64-bit Windows 7 with ArcGIS 10.0

Thanks,

Carly

Re: please help me with land cover change detection with ArcGIS 10.1

curtvprice — Wed, 08 Jan 2014 14:43:21 GMT

Hi I am working on a similar project. I am trying to compare land cover in the UK in 2000 and 2007. I have a .asc file for each year with 10 habitat classes. I want to use combine in the spatial analyst toolbox but my issue is that the value field in the attribute tables varies slightly i.e some of the same habitats have been assigned different values in each year. I can find no way of editing the values. Any ideas how I can get round this?

You need to convert your raster values using the Reclassify tool so your land cover classifications are the same among all your rasters.

Re: please help me with land cover change detection with ArcGIS 10.1

CarlyEasby — Wed, 08 Jan 2014 15:37:04 GMT

Great, that worked perfectly.

Thank you!

Carly