空间数据的采集与编辑.ppt

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1、空间数据的采集与编辑3.空间数据的采集与编辑空间数据采集是指将现有的地图、外业观测成果、航空像片、遥感图像、文本资料等转成计算机可以识别处理的数字形式。数据采集可分为属性数据采集和图形采集。3.1AutomatingdataManyspatialdataautomationoptionsOthervectorGISPapermapShapefileArcInfocoverageImageASCIIcoordinatefileRasterGISArcInfogridScanDigitizeConvertGenerateConver

2、tDigitizeGeodatabaseImport/ExportImport/ExportConvertRawcoordinates(onpaper)ManualentryConvertFuturereleasesCreatingnewdataScanningdataProducesrasterimageGeoreferenceafterscanningHeads-updigitizingDigitizeoverimageonscreenGeoreferencebeforeorafterdigitizingGeorefere

3、ncingyourdataLocatingyourdatainreal-worldcoordinatesSometimesdatamustbetransformedtothecorrectpartofcoordinatespace12,000,0004,000,00010,00018018010,0004,000,000UTM(meters)UTM(feet)DecimalDegreesCoordinatespaceAlldataexistsinthesameunitlesscoordinatespaceCreatingan

4、ewfeatureclassinArcCatalogCreatewithinadatasetorstandaloneDefinegeometrytype,spatialreference,andfieldsAddfeaturesinArcMapPointStreamDigitizinginArcMapUsetheCreateNewFeatureedittaskSpecifytolerancesSpecifypointorstreammodeConvertingexistingdigitaldataArcInfosupportst

5、heconversionofmultipleformatsWizardsandtoolsmakeconversionsimpleBatchprocessingforlargejobsMostdataconversionsoutputacoverageIGDSSDTSTIGERTXTMIFDXFCoverageShapefileGeodatabaseImportingdataintothegeodatabaseImporttoolavailableinArcCatalogandArcToolboxGeodatabaseBuildC

6、overageAttributetableAOriginaldataCoverageConvertorcreatePostprocessing:TopologyAutomationprocessesmaynotconstructtopologyforoutputcoveragesArcToolboxBuildandCleantoolsCoveragesonlyEstablishesormaintainsspatialrelationshipsConnectivity,length,direction,area,andadjace

7、ncyCreatesorupdatescoveragefeatureattributetable(INFOformat)Build—AllfeatureclassesClean—PolygonsandlinesonlyCleancombinesBuildfunctionalitywitheditingcapabilitiesArcToolboxCleantolerancesDanglelengthFuzzytolerancesWillintersectallarcsthatcrossPostprocessing:Creating

8、domainsDefinedomainsfromfeatureclassordatabasepropertiesEnterthedomainpropertiesEnterthenameordescriptionEnterthecodedvaluesClickon