WMS:Mapping Tables: Difference between revisions
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A '''mapping table''' or '''map table''' is used by WMS to link values within a project. There are multiple ways this can be accomplished: | |||
*For [[WMS:GSSHA|GSSHA]], WMS assign model parameter values to grid cells by linking parameter values to index maps. | |||
*For [[WMS:GIS|GIS]], this is done by creating a lumped average based on the percentages of land use values or soil types within a basin. | |||
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This can be done with either a lumped average or This is used for [[WMS:Land Use|Land Use coverages]] and [[WMS:Soil|Soil Type coverages]]. | |||
different depending on whether composite curve numbers or runoff coefficients are being computed. A mapping table must be imported using the '''Import''' button prior to computing the composite curve numbers. The radio group above the mapping window specifies whether the land use or soil type mapping table is displayed. For a land use or soil type coverage the mapping table may be set up interactively by selecting each polygon and assigning the appropriate parameters. Such files can then be exported and later imported. For grid attributes, define a land use or soil type table by defining a land use or soil type coverage and then using the '''Attributes''' command from the ''Feature Objects'' menu (in the Map module) to define individual polygon attributes that constitute the table. See [[WMS:Land Use|Land Use coverages]] and [[WMS:Soil|Soil Type coverages]] for information on assigning parameters to land use and soil type polygon coverages. See [[WMS:WMS Supported File Formats|File Formats]] for the different mapping parameters. | |||
==Composite CN Table== | ==Composite CN Table== | ||
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==Runoff Coefficient Table== | ==Runoff Coefficient Table== | ||
{{main|WMS:Soil Type Runoff Coefficient Files}} | |||
The [[WMS:Runoff Coefficient Table|runoff coefficient table]] must be defined to relate soil type IDs to runoff coefficient values. A very simplified file named soiltype.tbl is provided with the distribution of WMS. This file can be edited to supply user defined values or a new table with the same format can be created. See [[WMS:Soil Type Runoff Coefficient Files|Soil Type Runoff Coefficient Files]] to view the format of the table. | The [[WMS:Runoff Coefficient Table|runoff coefficient table]] must be defined to relate soil type IDs to runoff coefficient values. A very simplified file named soiltype.tbl is provided with the distribution of WMS. This file can be edited to supply user defined values or a new table with the same format can be created. See [[WMS:Soil Type Runoff Coefficient Files|Soil Type Runoff Coefficient Files]] to view the format of the table. | ||
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==Related Topics== | ==Related Topics== | ||
* [[WMS:Compute GIS Attributes|Compute GIS Attributes]] | * [[WMS:Compute GIS Attributes|Compute GIS Attributes]] | ||
Revision as of 00:18, 18 December 2019
A mapping table or map table is used by WMS to link values within a project. There are multiple ways this can be accomplished:
- For GSSHA, WMS assign model parameter values to grid cells by linking parameter values to index maps.
- For GIS, this is done by creating a lumped average based on the percentages of land use values or soil types within a basin.
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