Converting a NEXRAD Rainfall Map into a Flood Inundation Map by ...

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pathname card using the ZRRTS DSS subroutine which returns the data type asan output argument. Arc Hydro stores the data type descriptor in the TSType tableunder the DataType field name and using a coded value domain.The corresponding equivalences between the data type classifications inArc Hydro and HEC-DSS are shown in Table 4.7.Table 4.7: Data Type Equivalence between HEC-DSS and Arc HydroThe DSS2GDB application uses the above system equivalences to transferDSS records over to the Arc Hydro geodatabase by properly populating theDSSTSType and TSType table.The Time Series TypeTime series records can be measured or observed at regularly orirregularly spaced intervals. This classifying criterion is supported by both HEC-DSS and Arc Hydro. The HEC-DSS system stores the data type as a header of thepathname card and not as a pathname part. After the DSS file has been open andthe DSS catalog has been created, the DSS2GDB application uses the ZDTYPEDSS subroutine to obtain the time series type for any of the pathnames inside the136
catalog list. For the DSS2GDB application, the program selects those pathnamesassociated with flow change locations and extracts the time series type using theZDTYPE DSS subroutine to decide what subroutine should be used for extractingthe time series values and to define the time series type descriptor in Arc Hydro.Even though the time series used and generated for the Map2Map application areregularly spaced intervals, the application checks for other types of time series toprovide a generic approach.In Arc Hydro the time series type it is stored in the TSType table under theIsRegular Boolean field. The corresponding equivalences between the time seriestype classifications in Arc Hydro and HEC-DSS are shown in Table 4.8.Table 4.8: Time Series Type Equivalence between HEC-DSS and Arc HydroAfter the ZRRTS DSS subroutine is executed, and the time series areextracted from HEC-DSS, the application invokes ZCLOSE, the DSS softwaresubroutine in charge of releasing control of a DSS file from an external program.This closing subroutine is quite important to make sure the DSS file becomesavailable to other external programs. From the programmatic perspective thissubroutine must be carefully implemented since it should be invoked even if anerror is generated during execution. That is, the error handling component must137
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Table of ContentsList of Figures ..
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4.1.12 The XML2GDB Script Tool ....
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Figure 3.24 Components of a Steady
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Figure 4.50 Create Flood Inundation
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Chapter 1 Introduction1.1 BACKGROUN
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for undeveloped or natural conditio
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All the previous statements favor t
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science, and engineering models as
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Different approaches have been used
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generic and self-described formats,
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externally executed from a central
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though GIS-based, the system does n
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Geographic Information Systems, Arc
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By defining the three basic functio
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containing an inventory of damage s
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Data Models in charge of storing an
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Figure 3.1 Floodplain Modeling Sche
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either with Schematic Nodes (for Su
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channel cross sections, available H
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sequential data, called pathnames,
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Figure 3.5 NEXRAD square cells (873
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geodatabase formatted with the Arc
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The CrossSection feature class in A
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geodatabase (under Arc Hydro format
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3.4.4 External Execution of HEC-RAS
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analysis. In particular, GIS has be
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3.5.3 Model-Specific ElementsA geog
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Figure 3.11 Geographic and Hydrolog
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For HEC-RAS, the connectivity is ac
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cross sections in the hydraulic mod
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Section line for a RAS cross-sectio
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from the geodatabase back into the
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Figure 3.19 Relationship Classes fo
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Figure 3.20 DSS Time Series content
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Figure 3.22 Extended Time Series Co
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Figure 3.23 Creating a Flow File fr
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etween the HEC-DSS file system and
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The more specific steps for the pos
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Chapter 4 Map2Map Components4.1 MOD
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A subset of NEXRAD time series data
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A folder location is also provided
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Figure 4.4 Radar2GDB Model Componen
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ecords. Figure 4.6 illustrates the
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Figure 4.8 Time Series Tables and R
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having different formats and that a
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Part E: Time Interval of stored dat
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Page 99 and 100: Len_sBTime (I): The length of the s
Page 101 and 102: 52: Invalid precision exponent spec
Page 103 and 104: methods: user hyetograph, user gage
Page 105 and 106: Once the hyetograph is defined (for
Page 107 and 108: The resulting runoff hydrograph is
Page 109 and 110: Thus, the time period for the entir
Page 111 and 112: After the ZSRTS subroutine is execu
Page 113 and 114: Figure 4.12 HMSCaller Model Compone
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Page 117 and 118: These simple command line statement
Page 119 and 120: To programmatically accomplish this
Page 121 and 122: to provide the hydraulic input for
Page 123 and 124: information into the extended Arc H
Page 125 and 126: The HydroJunction, used for connect
Page 127 and 128: Once the identification of flow cha
Page 129 and 130: As with the GDB2HMSDSS, the first t
Page 131 and 132: 4.1.7 Time Series ExtractionOnce th
Page 133 and 134: accomplish this have been developed
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Page 137 and 138: As opposed to HEC-DSS, the Arc Hydr
Page 139 and 140: Table 4.4: Variable Type Equivalenc
Page 141 and 142: ZCAT DSS subroutines) and stored in
Page 143 and 144: Table 4.5: Time Interval Equivalenc
Page 145: There are not specific valid values
Page 149 and 150: 4.1.9.1 Opening the HEC-DSS fileThe
Page 151 and 152: channel (the hydraulic representati
Page 153 and 154: the model if the new configuration
Page 155 and 156: the main program as a public module
Page 157 and 158: Then, the RASCaller application acc
Page 159 and 160: Figure 4.31 ProjectName Property in
Page 161 and 162: Figure 4.33 RunSteady Method in RAS
Page 163 and 164: Figure 4.34 ExportGIS Method in RAS
Page 165 and 166: data structures delivered by every
Page 167 and 168: The two most well-known models for
Page 169 and 170: The water surface elevations obtain
Page 171 and 172: Once the water surface elevations f
Page 173 and 174: Generate a suitable water surface m
Page 175 and 176: Figure 4.42 2 Foot-Contour Lines fo
Page 177 and 178: Figure 4.43 Rosillo Creek’s terra
Page 179 and 180: standard ArcGIS tool), is used in M
Page 181 and 182: By doing this, the water surface el
Page 183 and 184: Figure 4.49 Create Flood Polygon Mo
Page 185 and 186: Int OperationThe Integer operation
Page 187 and 188: case that was developed for Map2Map
Page 189 and 190: contours (isohyetals) or by interpo
Page 191 and 192: design storm input given its possib
Page 193 and 194: Figure 4.55 Workflow for Extracting
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model for water resources (Maidment
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Hydro, the HydroJunctionHasCrossSec
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involved in the transformation of r
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process model in sequence. For the
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5.6 A TRUE SPATIAL APPROACHAutomate
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time series between NEXRAD, the HEC
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value of the entire runoff hydrogra
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case study. Bigger watersheds (abov
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The first step consists in installi
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3.7 Map2Map UsageAll of the model b
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Congratulations! You have successfu
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Once the simplified version of Arc
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cells that cover your study area an
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Second, the user needs to modify th
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Appendix BMap2Map CD Content1 CD Da
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o hmsproj - contains folders with H
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Goodchild, M.F., Steyaert, L.T., an
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Olsen R. J., Beling, P. A., Lambert
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Werner, M. G. F. 2001. Impact of gr
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Converting a NEXRAD Rainfall Map into a Flood Inundation Map by ...

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