Land cover mapping of Asia , Central Asia, and Middle East for GLC2000 project Ryutaro Tateishi, Hiroshi Sato, and Zhu Lin Center for Environmental Remote Sensing (CEReS), Chiba University Japan GLC 2000 – “FIRST RESULTS” WORKSHOP JRC – Ispra, March 2002
Area Coverage Asia 5-57 North lat East long. Central Asia North lat East long. Middle East North lat East long. Used data VEGETATION S-10 NDVI data sets
Legend Based on “The GLC2000 global legend Version 1.0” by H.J.Stibig Ground truth Totally 86 small regions were selected as ground truth sites. (43 sites for Asia, 30 sites for Central Asia, and 13 sites for Middle East) Number of land cover classes of ground truth is classes are from Stibig’s “The GLC2000 global legend Version 1.0”, and 3 additional classes. Classification Maximum Likelihood method for monthly NDVI except December
Land cover classes in the classified result recorded code, LCC code, and land cover paddy artificial surface cultivated area needle leaved evergreen forest needle leaved deciduous forest broadleaved deciduous forest sparse shrubs herbaceous aparse vegetation /20454herbaceous closed vegetation /20458herbaceous vegetation with shrubs /40406wetland
Land cover classes in the classified result (continued) bare rock unconsolidated materials bare soil loose sands natural water body snow (additional class with LCC formula) 207 -pasture & crop A5XXB5C1D1D9-S corn & bean A5XXB5C2-S0305S paddy & corn A4XXB5C2-S0308S0305
Global Land Cover Ground Truth database (GLCGT database) The GLCGT database consists of regional land cover ground truth (RLCGT) data. The geographical size of a RLCGT data is flexible, from a city size to a continental size. --- metadata of RLCGT data (text) --- GT land cover code data (raster) --- GT site code data (raster) --- description of GT sites (text) --- optional data (text, raster, or any)
Classified image of Asia
Classified image of Central Asia (Kazakhstan)
Classified image of Middle East
Accuracy assessment Accuracy assessment has done together in Asia, Central Asia, and Middle East. Training sample data were divided into two groups, group A and group B, for accuracy assessment. Accuracy training data validation data accuracy all GT (A+B) all GT (A+B) 99% GT A GT B 59% GT B GT A 42%
Conclusions -Asia, Central Asia and Middle East were classified to 20 land cover types by Maximum Likelihood method of monthly (except December) NDVI. -Though one type of land cover may include different data characteristics in different regions, enough GT data from different regions results in better accuracy. - The trial of this classification suggests more GT data must be collected.
- Proposal: collect ground truth data based on “GLCGT database” concept among GLC2000 participants