Rivers_SA

20230816 20594100 FALSE 20230816 18482000 20230816 18482000 Rivers_limpopo 002 16.457263 32.881383 -34.770052 -22.125640 1 Geographic GCS_Hartebeesthoek_1994 Angular Unit: Degree (0.017453) <GeographicCoordinateSystem xsi:type='typens:GeographicCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.1.0'><WKT>GEOGCS["GCS_Hartebeesthoek_1994",DATUM["D_Hartebeesthoek_1994",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433],AUTHORITY["EPSG",4148]]</WKT><XOrigin>-400</XOrigin><YOrigin>-400</YOrigin><XYScale>1111948722.2222221</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>8.983152841195215e-09</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><LeftLongitude>-180</LeftLongitude><WKID>4148</WKID><LatestWKID>4148</LatestWKID></GeographicCoordinateSystem> 1.0 150000000 5000 ItemDescription ESRI ArcCatalog 9.2.4.1420 en Rivers of South Africa Details available at: http://www.dwaf.gov.za/iwqs/gis_data/river/rivs500k.html Rivers of South africa, categorised Cape datum 1994 - Digital data supplied to Department of Water Affairs 1995 - Rivers selected to match national monitoring network by GisLAB - Gaps in rivers at dams closed - Rivers made to point downstream - Strahler ordering applied - Some river names checked - still 50% unlabelled arcs - perennial / non-perennial classification inconsistent - WARNING - Digitising at 1:500 000 with 1mm accuracy implies errors of up to 500 metres. Each original map sheet may have its own offset... 1996 to 2003 - Rivers adjusted to match arcs on 1:50 000 maps - Obvious drainage errors corrected - River orders re-calculated with Lamphear and Lewis' STREAM_ORDER.AML - REACHCODE allocated to each inter-node stretch (based on main quaternary drainage) - SORTER code allocated (increases downstream) - Names corrected where possible, ALIAS field added for alternatives - LENGTH_KM field added to retain arc lengths in geographic projection - Rivers added to "empty" quaternary drainage regions: A62E, A62F, A91A, A91E, G40H, M20A, U70F, W60M, X32E, Y10H, Y60A. - Quaternary drainage regions confirmed as "dry": D62H, H80F, Z10D - First public beta release of rivers 2003-06-20. 2004 - Limpopo rivers in Mozambique updated with the Atlas for Disaster Preparedness and Response in the Limpopo Basin, INGC, University of Eduardo Mondlane Department of Geography and USAID/FEWS NET MIND 2003. 2005 - Michael Silberbauer used Shuttle Radar Topography 90-metre DEM data to improve river alignments in Lesotho (no 1:50_000 data available for most of Lesotho). - Lungile Gaulana checked through the naming of river arcs, making about 5000 changes to names and alignments. - Michael Silberbauer used the South African Geographical Names System web site (http://sagns.dac.gov.za) to update the official naming and orthography. - Accuracy in comparison with the 1:50_000 data, for the area of South Africa, Lesotho and Swaziland, based on a random 1% sample of arcs: Spatial: 94.6% OK, 4.3% no 1:50_000 data, 1.1% > 50 metre error. Attributes: Names: 97.8% OK, 2.2% wrong Alias: 95.7% OK, 4.3% wrong Class: 83.9% OK, 10.8% non-perennial wrong, 5.4% perennial wrong. 2006 - Michael Silberbauer used RivEX (http://www.rivex.co.uk/) to verify the topology. Found and corrected about 100 previously undetectable errors (microloops and double vertices). - JOINITEMed these fields generated by RivEX: SHREVE : Shreve order US_ACCUM : Accumulated upstream metres at the downstream node of each arc CATCHID : Automatically generated ID for each end node (END=E or M) DIST2MTH : Distance to the mouth in metres at the upstream node of each arc Resource Quality Services (was IWQS) and Chief Directorate of Surveys and Mapping 2003-05-21 2003-05-23 2003-05-28 2003-05-30 2003-06-04 2003-06-11 2003-06-17 2003-06-18 2003-06-20 2003-08-21 2003-10-13 2004-04-20 2004-04-20 2004-11-18 2004-11-23 2005-07-11 2005-07-26 2006-02-23 2006-08-22 Rivers_SA_dd wriall500_ClipRSA vector digital data withheld withheld publication date 2003-05-21 2003-05-23 2003-05-28 2003-05-30 2003-06-04 2003-06-11 2003-06-17 2003-06-18 2003-06-20 2003-08-21 2003-10-13 2004-04-20 2004-04-20 2004-11-18 2004-11-23 2005-07-11 2005-07-26 2006-02-23 2006-08-22 In work As required 15.983330 33.999252 -19.791433 -34.769989 15.983330 33.999252 -34.769989 -19.791433 REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords. REQUIRED: Common-use word or phrase used to describe the subject of the data set. Not yet available, use these words instead: Rivers of South Africa State Copyright: please acknowledge source State data in the public domain: Copies of digital data may be given to third parties only with this metadata included. Beta test - evaluate at own risk - inform custodian of problems! Shapefile Resource Quality Services (was IWQS) and Chief Directorate of Surveys and Mapping +27 12 808 9500 +27 12 808 0338 SilberbauerM@dwaf.gov.za

Department of Water Affairs and Forestry Private Bag X313 PRETORIA 0001

South Africa Resource Quality Services (was IWQS) and Chief Directorate of Surveys and Mapping withheld Esri ArcGIS 13.1.0.41833 Rivers_limpopo 15.98333 33.999252 -19.791433 -34.769989 1 15.98333 33.999252 -19.791433 -34.769989 1 1 16.457263 32.881383 -22.125640 -34.770052 Rivers of South africa, categorised <DIV STYLE="text-align:Left;"><DIV><P><SPAN>Rivers of South Africa Details available at: http://www.dwaf.gov.za/iwqs/gis_data/river/rivs500k.html</SPAN></P></DIV></DIV> Resource Quality Services (was IWQS) and Chief Directorate of Surveys and Mapping Rivers of South africa categorised <DIV STYLE="text-align:Left;"><DIV><P><SPAN>State data in the public domain: Copies of digital data may be given to third parties only with this metadata included. Beta test - evaluate at own risk - inform custodian of problems!</SPAN></P></DIV></DIV> en FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time Michael Silberbauer Resource Quality Information, Resource Quality Services, Department of Water Affairs and Forestry Private Bag X313 Pretoria South Africa 0001 +27 (0) 12 808 9500 +27 (0) 12 808 0338 SilberbauerM@dwaf.gov.za 20080328 ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset Downloadable Data 0.000 0.000 002 withheld Local Area Network 0.000 Shapefile File Geodatabase Feature Class Vector Simple FALSE 0 TRUE FALSE GCS_Hartebeesthoek_1994 Decimal degrees 0.000000 0.000000 D_Hartebeesthoek_1994 WGS_1984 6378137.000000 298.257224 GCS_Hartebeesthoek_1994 EPSG 4.5(8.1.0) END 1 String END 0 0 OBJECTID_1 OBJECTID_1 OID 4 0 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Rivers_limpopo Feature Class 0 OBJECTID OBJECTID Integer 4 0 0 FNODE_ FNODE_ Double 8 0 0 SORTER 9 String SORTER 0 0 LENGTH 4 12 Single LENGTH 0 0 NAME 40 String NAME 0 0 ALIAS 40 String ALIAS 0 0 CLASS 40 String CLASS 0 0 REACHCODE 10 String REACHCODE 0 0 LENGTH_KM 4 12 Single LENGTH_KM 0 0 PRIMARY 1 String PRIMARY 0 0 Shape Shape Geometry 0 Feature geometry. ESRI Coordinates defining the features. 0 0 TNODE_ TNODE_ Double 8 0 0 DIST2MTH DIST2MTH Double 8 0 0 LPOLY_ LPOLY_ Double 8 0 0 RPOLY_ RPOLY_ Double 8 0 0 TMPRIV_ TMPRIV_ Double 8 0 0 TMPRIV_ID TMPRIV_ID Double 8 0 0 STRAHLER STRAHLER Double 8 0 0 SHREVE SHREVE Double 8 0 0 US_ACCUM US_ACCUM Double 8 0 0 ORDER_ ORDER_ Integer 4 0 0 Shape_Leng Shape_Leng Double 8 0 0 Shape_Length Shape_Length Double 8 0 0 Length of feature in internal units. Esri Positive real numbers that are automatically generated. 20230816 0 Dataset copied. withheld 20080218 15360800