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

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Figure 4.28 RASCaller ModelBuilder ComponentThe execution of HEC-RAS is done through the HEC-RAS object librarythat exposes some execution and writing functionalities. The ras.exe applicationfor HEC-RAS version 3.1.1 and above is packaged as an ActiveX EXEcomponent that provides reusable code in the form of objects. This applicationformat for HEC-RAS allows external applications (clients), like the RASCallerprocess in Map2Map, to instantiate objects and calls their properties and methods.The objects are designed to divide and make available the main functionalities ofthe component (the HEC-RAS model in this case).An ActiveX EXE is a special type of COM component (ComponentObject Model is a protocol that enables software components to communicate toeach other) that can be linked to other components to build applications. One ofthe best known examples of COM Object Linking and Embedding (OLE)technology implementation is the ability of Word documents to dynamically linkto data in Excel spreadsheets. An ActiveX EXE is both an EXE file (it is loadedinto its own address space and given its own process and threads) and it is alsodesigned to be an OLE automation server (an ActiveX DLL). As with anyActiveX DLL, it exposes interfaces (classes) to be used by a client application(the RASCaller in Map2Map in this case).146
Then, the RASCaller application accesses the exposed functionality inHEC-RAS by making a reference to the “HEC River Analysis System”application (HEC-RAS) which becomes available as a COM component afterHEC-RAS is installed in the local computer.Figure 4.29 HEC-RAS Object Library Reference in Visual BasicAfter the application makes the reference to the HEC-RAS library, all theclasses (objects) in that library become available to the application (theRASCaller application) and a great deal of additional functionality is gainedthrough the properties, methods, and events of those classes.The HECRASController class is the main object used in the RASCaller toaccess HEC-RAS’s exposed functionality. The HECRASController provides 32147
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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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execution time and for their corres
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on the steps needed to transfer the
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Len_sBTime (I): The length of the s
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52: Invalid precision exponent spec
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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
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Page 113 and 114: Figure 4.12 HMSCaller Model Compone
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Page 119 and 120: To programmatically accomplish this
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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
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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
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Page 149 and 150: 4.1.9.1 Opening the HEC-DSS fileThe
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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
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Page 171 and 172: Once the water surface elevations f
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Page 175 and 176: Figure 4.42 2 Foot-Contour Lines fo
Page 177 and 178: Figure 4.43 Rosillo Creek’s terra
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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
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Page 193 and 194: Figure 4.55 Workflow for Extracting
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Page 199 and 200: Hydro, the HydroJunctionHasCrossSec
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Page 205 and 206: 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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