Digital Terrain Model (DTM) for the Lower Mekong Basin

Data format: SDE Raster Dataset

Coordinate system: Indian_1954_UTM_Zone_48N

Location: Server=mekserv3; Service=5153; Database=mrc; User=sde; Version=sde.DEFAULT
Abstract: Digital Terrain Model (DTM) for the Lower Mekong Basin. It is an updated version that derived from updating B-DTM50 with more detailed DEMs (MUN_DEM20, and DEM100) over the area of Mun River Basin and Mekong Delta (area from Phnom Penh to Center of MK delta).

ISO and ESRI Metadata:
Metadata elements shown with blue text are defined in the International Organization for Standardization's (ISO) document 19115 Geographic Information - Metadata. Elements shown with green text are defined by ESRI and will be documented as extentions to the ISO 19115. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog.
Metadata Information


*Metadata language: English
*Metadata character set: utf8 - 8 bit UCS Transfer Format


*Last update: 20050912


Metadata contact:
Individual's name: Kunthea Nuon
Organization's name: Mekong River Commission
Contact's position: GIS Assistant
Contact's role: publisher


Contact information:
Phone:
Voice: +856 21 263 263
Fax: +856 21 263 264

Address:
Delivery point:
No.184, Unit 18, Fa Ngoum Rd., Ban Sithane Neua
City: Sikhotlabong District, Vientiane
Postal code: 01000
Country: Lao PDR
e-mail address: mrcs@mrcmekong.org

*Scope of the data described by the metadata: dataset
*Scope name: dataset


*Name of the metadata standard used: ISO 19115 Geographic Information - Metadata
*Version of the metadata standard: DIS_ESRI1.0


*Metadata identifier: {6F6392FE-8FAB-40E5-BAFA-E73470B429E6}


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Resource Identification Information:


Citation:
Title: Digital Terrain Model (DTM) for the Lower Mekong Basin


Reference date:
Date: 20030514
Type of date: creation

Reference date:
Date: 20030514
Type of date: publication

Edition date: 20030514
*Presentation format: digital map


Party responsible for the resource:
Individual's name: Ulf Hedlund
Organization's name: Mekong River Commission
Contact's position: GIS/Database Team Leader
Contact's role: point of contact


Contact information:
Phone:
Voice: +856 21 263 263
Fax: +856 21 263 264

Address:
Delivery point:
No.184, Unit 18, Fa Ngoum Rd., Ban Sithane Neua
City: Sikhotlabong District, Vientiane
Postal code: 01000
Country: Lao PDR
e-mail address: mrcs@mecmekong.org

Party responsible for the resource:
Individual's name: Penroong Bamrungrach
Organization's name: Mekong River Commission
Contact's position: GIS Specialist
Contact's role: publisher


Contact information:
Phone:
Voice: +856 21 263 263
Fax: +856 21 263 264

Address:
Delivery point:
No.184, Unit 18, Fa Ngoum Rd., Ban Sithane Neua
City: Sikhotlabong District, Vientiane
Postal code: 01000
Country: Lao PDR
e-mail address: mrcs@mrcmekong.org

Party responsible for the resource:
Individual's name: Kunthea Nuon
Organization's name: Mekong River Commission
Contact's position: GIS Assistant
Contact's role: publisher


Contact information:
Phone:
Voice: +856 21 263 263
Fax: +856 21 263 264

Address:
Delivery point:
No.184, Unit 18, Fa Ngoum Rd., Ban Sithane Neua
City: Sikhotlabong District, Vientiane
Postal code: 01000
Country: Lao PDR
e-mail address: mrcs@mrcmekong.org

Themes or categories of the resource: elevation


Abstract:
Digital Terrain Model (DTM) for the Lower Mekong Basin.  It is an updated version that derived from updating B-DTM50 with more detailed DEMs (MUN_DEM20, and DEM100) over the area of Mun River Basin and Mekong Delta (area from Phnom Penh to Center of MK delta).

*Dataset language: English


Resource constraints:
Constraints:
Limitations of use: The Mekong River Commission make no warranties about this data and disclaim all responsibility and liability for all expenses, losses, damages and costs which may be incurred as a result of the data being inaccurate or incomplete in any way and for any reason. The data contained herein do not imply the expression of any opinion whatsoever on the part of the Mekong River Commission concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delineation of its frontiers or boundaries.


Legal constraints:
Access constraints: copyright, license


Use constraints: copyright, license


*Spatial representation type: grid


*Processing environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535


Resource's bounding rectangle:
*Extent type: Full extent in decimal degrees
*Extent contains the resource: Yes
*West longitude: 98.890098
*East longitude: 109.225444
*North latitude: 22.53588
*South latitude: 8.519244

Other extent information:
Geographic extent:
Bounding rectangle:
*Extent type: Full extent in the data's coordinate system
*Extent contains the resource: Yes
*West longitude: -129559.993691
*East longitude: 934890.006309
*North latitude: 2491938.3125
*South latitude: 946288.3125

Point of contact:
Individual's name: Ulf Hedlund
Organization's name: Mekong River Commission
Contact's position: GIS/Database Team Leader
Contact's role: point of contact


Contact information:
Phone:
Voice: +856 21 263 263
Fax: +856 21 263 264

Address:
Delivery point:
No.184, Unit 18, Fa Ngoum Rd., Ban Sithane Neua
City: Sikhotlabong District, Vientiane
Postal code: 01000
Country: Lao PDR
e-mail address: mrcs@mecmekong.org

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Spatial Representation - Grid:


*Level of topology for this dataset: geometry only
Geometric objects:
*Name: SDE.TOPOG_B_DTM50UPD
*Object type: complexes
*Object count: 1346

Number of dimensions: 2
Axis dimensions properties:
Dimension:
*Dimension name: column (x-axis)
*Dimension size: 21289
Resolution:

Dimension:
*Dimension name: row (y-axis)
*Dimension size: 30913
Resolution:

*Cell geometry: area


*Transformation parameters are available: Yes


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Reference System Information:


Reference system identifier:
*Value: Indian_1954_UTM_Zone_48N


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Data Quality Information:


Scope of quality information:
Level of the data: dataset


Lineage:
Lineage statement:
AREA :	 
IN THE LOWER MEKONG BASIN INCLUDING:   Cambodia (whole country, incl non-LMB part),   Laos (whole country, incl non-LMB part),   Thailand (LMB part),   Vietnam (LMB part);				
				SOURCE MAP :
				1) Original DTM50 (B-DTM50) - American topo maps 1:50'000 and partiallly on Russian topo maps 1:100'000
				2) Mun River Basin (MUN_DEM20) - 1:10,000 Topographic Map, 1982
				3) Mekong floodplain from Phnom Penh to Center of Vietnamese Mekong Delta (DEM100) - unknown
				4) DEM of Tonle Sap Region - unknown;
				
				SOURCE DATA SET :
				1) B-DTM50: Watershed Classification Projects, WSCP
				2) MUN_DEM20: mun_ct.shp (1m contours of Toong Kura Rong Hai, Surin Province ,Thailand) and mun_sh.shp (spot height of Toong Kura Rong Hai, Surin Province, Thailand)
				3) DEM100: CT_BON - elevation contours with varying vertical intervals
				above source data sets derived from:
				hypsometric contour map
				scale: 1:100,000
				date: 1960s
				compiling agency: SOGREAH - Societe Grenobloise d'Etudes et
				d'Applications Hydrauliques (for MRCS Predecessor)
				above source data sets generated by: MRCS Technical Support Division 
				4) DEM50: CONTOUR - elevation contours with 1 meter vertical intervals
				STREAM - streams [hydrographic features composed of single lines]
				all above source data sets derived from:
				topographic map
				scale: 1:100,000 (re-compiled from original scale of 1:40,000)
				date: 1964
				compiling agency: Certeza Surveying Co. Inc. (for MRCS Predecessor)
				above source data sets generated by:  MRCS Technical Support Division;
				
				SOURCE AGENCY :
				1) Centre for Development and Environment, University of Bern and MRCS
				2) Royal Irrigation Department, Topographic Survey Unit, Thailand
				3) CT_BON dataset was generated by MRC Technical Support Division (TSD)
				4) DEM50 - data generated by MRCS Technical Support Division;
				
				GENERATION :
				1) B-DTM50: Dataset was created by Watershed Classification Projects, WSCP. For details see WSCP Tecnical Reports (available from the MRCS TSD) 
				2) MUN_DEM20: Generated using the TOPOGRID program in ArcINFO 7.2.1
				Program parameters;
				topogrid mun_dtm3 20
				datatype contour 
				enforce ON
				outputs sinks3 drains3 report_mun_dtm3.txt
				boundary hull3
				contour mun_ctall3 elev
				point mun_shall2 elev
				lake mun_lake
				tolerances 0.5 1 0
				end
				3) DEM100: Data generated from above source data with Arc/Info TOPOGRID setting as follows:
				contour CT_BON elev
				datatype contour
				enforce off
				iterations 50
				tolerances 0.1 0.5 0
				xyzlimits 550000 179000 450000 0 350
				resoluting grid data projected as follows:
				from system:
				Projection: Bonne Indochina (Paris Meridian)
				Initial Point: east: 103.5 deg, north: 17.1 deg, X: 700000, Y: 1000000
				Horizontal Datum: Hanoi Belvedere (dx: -471 dy: -321 dz: 165, meridian shift: -2.33722916666667 deg)
				Spheroid: Clarke 1880 IGN (sem maj axis: 6378249.2 inv flat: 293.4660213)
				to system:
				see below under UNITS
				4) DEM50: data generated from above source data with ARC/INFO TOPOGRID settings as follows:
				contour CONTOUR elev
				datatype contour
				enforce on
				iterations 50
				stream STREAM
				tolerances 0.5 0.5 0
				xyzlimits 262025 1348025 497975 1516975 0 20
				5) above four datasets were merged into update basin DTM with cell resolution 50m using the following parameters:
				a) merging DEMS: 
				DEM-MRG1 = MERGE (resample(Mun_20, 50, bilinear), resample(Dem100, 50, bilinear), Dem50)
				b) merging DEMs:
				B-DTM50UPD = MERGE (INT(DEM-MRG1 + 0.5), B-DTM50)
				
				Note: the original DEMs, except B-DTM50, are floating format.  They were converted to inter format to merge with B-DTM50. With adding 0.5 to all cells, the dicimal values were rounded instead of truncated;
				
				STATUS :
				Last updated: Compiled by Penroong B. (14 May 2003)  
				Completion status: 100 %;
				
				COMMENTS :
				1) Negative Values in the DTM do not only occure along the seaside in Cambodia, but in some areas not the whole map sheet had to be procesed (as some areas were not of LMB).  And there minus values may occure. --> consult coverage b-dtmmin
				2) DEM50 (Tonle Sap Region): calculated horizontal accuracy of source data: 65 meters
				estimated vertical accuracy of source data: 1 meter
				the elvation range modeled is constricted to 1 to 20 meters asl
				all areas below or above this level have been set to NODATA
				the lowest elevation of the Tonle Sap Lake has been assumed to be 1 meter asl;
				
				RASTER :  Resolution: 50 meter cell size;
				
				VALUE ATTRIBUTE TABLE (vat) for grids :
				Value =	Elevation in meters above sea level (integer format).

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Distribution Information:


Distributor:
Contact information:
Individual's name: MRC Secretariat
Organization's name: Mekong River Commission
Contact's position: Custodian
Contact's role: distributor


Contact information:
Phone:
Voice: +856 21 263 263
Fax: +856 21 263 264

Address:
Delivery point:
P.O. Box 6101
City: Sikhotlabong District, Vientiane
Postal code: 01000
Country: Lao PDR
e-mail address: mrcs@mrcmekong.org

Available format:
*Format name: SDE Raster Dataset
Format version: ArcGIS 8.3


Ordering process:
Terms and fees: Visit http://www.mrcmekong.org
Instructions:
Visit http://www.mrcmekong.org

Transfer options:
*Transfer size: 0.000


Online source:
*Online location (URL): Server=mekserv3; Service=5153; Database=mrc; User=sde; Version=sde.DEFAULT
*Connection protocol: ArcSDE Connection
Function performed: information
Description: Downloadable Data

Medium of distribution:
Medium name: CD-ROM


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Binary Enclosures:


Thumbnail:
Enclosure type: Picture



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