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Development of NOAA and LDevelopment of NOAA and Landsat Image Server using Wandsat Image Server using W

eb Map Serviceeb Map Service

Mr. Sarawut Ninsawat and Mr. Sarawut Ninsawat and

Dr. Kiyoshi HondaDr. Kiyoshi Honda

This project is a part of Education and Research Project for Sustainable Development in the Greater Mekong Sub Region supported by Japanese Government.

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BackgroundBackgroundGIS and remote sensing (RS) have been taking a leading role for sustainable development.Many researchers have done numerous developments in utilizing GIS and RS data to various applications The potential of Geoinformatics has not been fully realized in the sense that data accessibility, integrity and their integration with existing GIS databases.

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Internet has high potential to give opportunities for people to access data easily.

Establishing a scheme to share and integrate geo-spatial information will contribute for the use of Geoinformatics in the society

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PurposePurposeTo develop Satellite image Map Server in AIT.

To establish mosaic image of LANDSAT over GMS countries.

Improve an access speed over WMS connection

To organize experiment for linking multiple Web Map Servers.

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OpenGIS 　 Consortium (OGC) Specification

Standard interface between Client and ServerPossible to send the request as message format to multiple servers (to the distributed environment) and get the result both of text and graphic data.

Possible to develop own system independently

Introduction of web mapping Introduction of web mapping technologytechnology

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Data being provided Data being provided NOAA/AVHRR NDVI image

the 30-day composite NOAA/AVHRR NDVI shown as FCC 121.

Landsat mosaic dataMosaic data of Thailand and GMS countries using Landsat 5 (raw Landsat scence were downloaded from http://www.glcf.umiacs.umd.edu/index.shtml)

Map datacoastline, boundaries, road, river. (VMAPO data source)

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30-day NOAA/AVHRR NDVI30-day NOAA/AVHRR NDVI

Jan 2001 Apr 2001 Oct 2001July 2001

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•This dataset covers 5.4 million square kilometers. Eight scenes of data were unavailable from this system.

•The original projection data is UTM with datum WGS84.

•The data amount of the mosaic image from 105 Landsat scenes (composed of 4 bands) is around 40 GB.

Landsat MosaicLandsat Mosaic

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• When handling very large raster layers, it is convenient and higher performance to split the raster image into a number of smaller images. Each file is tile of the larger raster mosaic available for display.

• The list of files forming a layer can be stored in a shapefile with polygon representing the footprint of each file, and name of the files.(called Tileindex)

• Mapserver will first scan the tile index and ensure that only raster files overlapping the current display request will be opened.

Tile index AlgorithmTile index Algorithm

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Code Name

1506 Thailand/1506.tif

1606 Thailand/1606.tif

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Two Two Improvement algorithms for SatImprovement algorithms for Satellite image serverellite image server  

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System overview (Agriculture client example)

Remote Sensing image serverNDVI 30 days data

Landsat mosaic data• For getting a request from the IT Forum client and se

nding to the client an image which is processed according to the request

Agriculture data client• For sending the requests to multiple server and gettin

g the image from multiple servers and combine multiple images

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System ConfigurationSystem Configuration

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NOAA NDVI 30 days image server NOAA NDVI 30 days image server exampleexample

http://203.159.10.13/gms/

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Landsat image server exampleLandsat image server example

http://203.159.10.13/gms/

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Comparison of image qualityComparison of image quality

Landsat 5 Original image Generated image from Mapserver

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Comparison of image qualityComparison of image quality

Original image from Landsat 5

image actual size is 266x209 Png 24 bit image generated from mapserver at 400x300 size

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Mobile GIS Application

User need RS images at fieldsBetter understanding of the siteFast and good decision making

Limitation of PocketPCSmall System Storage (64MB – 1GB)Impossible to store huge satellite image

Access to the Image server from fieldsWireless internet connection

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1) Send a position data and request image map

7) Send back image map

Pocket PC

GPS device

Internet

Spatial DB(Current position)

Password authorization

PHP

Minesota Mapserver

PostGIS/

PostgreSQLPng,jpeg

Remote Sensing Image Server

WMS connection

RSImage

Bluetooth Connection

Bluetooth Connection

2) Update position

3) Request image map from mapserver

4) Request RS image and point layer according to latest position

6) Combine RS image and Point Data -> Image Map

5) Send image map according to requested

Mobile

System configuration

http

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Mobile ApplicationAccessingAccessing to the WMS from Field using Mobile Deviceto the WMS from Field using Mobile Device

PDAPDA

MobileMobilePhonePhoneGPSGPS

BluetoothBluetooth

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Display Image Map

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Display Time of Image Map Image File

PNG 24 bitImage size 200 x 300 File size is approx 20 KB

Display Time of Image MapThailand’s GPRS speed (40.3 kbps) around 4 secondActual GPRS through put around 12– 13 secondEDGE Technology; 200 kbps ( 4 times faster )

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Server side image map

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GISTDA&RTAF

More Collaboration, More contributionMore Collaboration, More contribution

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More Collaboration, More contributionMore Collaboration, More contribution

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ConclusionsConclusionsBy implementing two algorithms ( tiling and multi-resolution ), the speed of response time was drastically improved. Multi-server system was tested and shown its efficiency to serve images to users as background images.The potential of OpenGIS and WebGIS like this prototype will promoting more linkage and cooperation.The broker to organize a new growing up of WMS server is required.Extend the utilization of RS image

Not limited to Desktop PC

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Thank you . .http://mapserver.hondalab.star.ait.ac.th/gms/

http://www.tsunami.ait.ac.th