Web-based On-demand Global NDVI Data Services
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Transcript of Web-based On-demand Global NDVI Data Services
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WEB-BASED ON-DEMAND GLOBAL NDVI DATA SERVICES
Presenter : Dayong Shen
Center for Spatial Information Science and Systems (CSISS), George Mason University
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SOURCE DATA: HDF-EOS (MOD13Q1)
-MOD13Q1 : 16-day 250-meter a gridded level-3 product in the Sinusoidal projection. It is MODIS standard product.
-We downloaded and processed the data spanning over 2000-2012.
-The datasets have prefect integrity as there is no missing date since 2000/02/18.
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VWMS,VWCS
Web-based on-demand NDVI services
NDVImax,NDVImin,VCIyyyy.mm.dd : global GeoTIFF image data
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FLOW CHART
Load Tile Data
Bad Quality Filtering
Add Land/Water Mask
Big/TIFF Creation
Big/TIFF Compression
TIFF Output
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GDAL UTILITIES
gdalinfogdal_translategdaladdogdalwarpgdal_merge.py
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C-C++ PROGRAM
#include <sys/types.h> #include <dirent.h> #include <stdio.h> #include <stdlib.h> #include <iostream> #include <string> #include <errno.h>
#include "gdal_priv.h" #include "cpl_string.h" #include "ogr_spatialref.h" #include "ogr_api.h"
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DATA QUALITY
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TIME TEST
Both VWMS and VWCS are pretty fast
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VWMS 1
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VWMS 2
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ONGOING WORK
- VWCS has been developed using C-C++, GDAL, Java and JavaScript- VWCS Will be available on the same web portal soon
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VWMS WEB LINK
http://gis.csiss.gmu.edu/GADMFS/
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Questions and Comments?