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

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example XML file holding data for the Rosillo Creek in San Antonio having a tagdefinition customized for water resources.Figure 4.36 XML File with Tag Definitions for Water ResourcesThe SDF2XML script tool converts the HEC-RAS SDF file into XMLformat, which represents an easier and more generic format for moving databetween applications, in this case to import the datasets into an Arc Hydrogeodatabase. As opposed to ASCII files, reading an XML file poses a parsingproblem that can be programmatically addressed by means of various objectmodels. The use of object models enables XML content to be presented tomainstream programming languages as a collection of objects with correspondingproperties and methods without requiring a specially formatted read statement.156
The two most well-known models for representing XMLprogrammatically (to enable efficient document navigation) are the DocumentObject Model (DOM) and the Simple API for XML (SAX). By using thesemodels, the hierarchical tree of data in the XML document can be parsedrecursively to retrieve data, data can be accessed by tag name, and a list of nodes(children of an element) can be retrieved. All of these object-oriented capabilitiescan also be reversed to accomplish population of XML documents with new data.Thus, the object models can be used not only for deciphering XML documents butalso to build them.The SDF2XML application uses the DOM model to load the entire XMLdocument into memory giving the flexibility to access any section of thedocument at any point in the application. To access a given section of the XMLdocument, the DOM parsing tools are used to instantiate objects that point to thedesired section and extract the information content by means of the object’smethods and properties. The XML objects that need to be represented by theDOM model are the elements, attributes, and nodes.In summary, the main advantage of an XML document is that it can betreated as a collection of objects and navigated as such instead of having to usetraditional and tedious text parsing methods. Also, the self-describing nature ofthe data in XML provides the data context and understanding needed forapplication integration exercises like the one attempted hereby.157
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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
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Once the hyetograph is defined (for
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The resulting runoff hydrograph is
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Thus, the time period for the entir
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After the ZSRTS subroutine is execu
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Figure 4.12 HMSCaller Model Compone
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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 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
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Page 147 and 148: catalog list. For the DSS2GDB appli
Page 149 and 150: 4.1.9.1 Opening the HEC-DSS fileThe
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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: data structures delivered by every
Page 169 and 170: The water surface elevations obtain
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
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
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Page 193 and 194: Figure 4.55 Workflow for Extracting
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Page 205 and 206: 5.6 A TRUE SPATIAL APPROACHAutomate
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Page 213 and 214: The first step consists in installi
Page 215 and 216: 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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