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

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epresented by the 2400 hour of the previous day and for Windows it isrepresented by the 12:00:00 A.M. time stamp of the next day without showing thetime stamp (the midnight abbreviation). The aforementioned midnight dualitybetween HEC-DSS and the Windows date notation is a very critical point in termsof data conversion between the two systems. In particular, the programmaticaspects of the midnight duality become quite crucial to ensure the correct transferof time series records between HEC-DSS and GIS. Figure 4.20 illustrates theschematic of the midnight duality.Figure 4.20 The Midnight DualityFigure 4.20 shows the Windows date notation above the time line for threemidnight points at the beginning of July. The Windows notation for midnightcorresponds to the 12:00:00 A.M. time stamp of the next day using the midnightabbreviation. The HEC-DSS date notation is shown below the time line. ForHEC-DSS the midnight point is label as the 2400 hours of the ending day. Careand consideration for this so called midnight duality was fundamental to achieve asuccessful framework for transferring time series data and to achieve the intendedintegration. In other words, format conversion between the two systems was124
straight forward for all time stamp points except for the midnight points in timethat required special considerations during conversion.The application extracts not only the time series values itself but also theDSS pathname parts (described is section 4.1.3) and headings (time series units,data type, and the time series type). Based on these HEC-DSS descriptors, theapplication populates the TimeSeries, TSType, and DSSTSCatalog tables. Toaccomplish this, equivalent values have to be associated for the application toknow what time series descriptor in Arc Hydro corresponds to a given descriptorin HEC-DSS. The following section describes the association between the ArcHydro and the HEC-DSS descriptors for the purpose of matching and populatingthe right equivalent and associated values.4.1.8 HEC-DSS and Arc Hydro AssociationsHEC-DSS configures the HEC data storage system for time series, whilethe Arc Hydro data model for water resources uses tables and relationship classesbetween them and owning features to define the time series component.For the DSS2GDB application to be able to transfer information fromHEC-DSS to the GIS geodatabase, it needs to be able to translate from DSSnomenclature to Arc Hydro nomenclature. The time series values themselves donot pose a need for conversion since the values are preserved. The time stamp asmentioned before needs to be generated for each value and then converted intoWindows date and time format.The time series descriptors are the most important elements that undergoconversion. The following section provides the details to be considered in this125
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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
Page 83 and 84: A folder location is also provided
Page 85 and 86: Figure 4.4 Radar2GDB Model Componen
Page 87 and 88: ecords. Figure 4.6 illustrates the
Page 89 and 90: Figure 4.8 Time Series Tables and R
Page 91 and 92: having different formats and that a
Page 93 and 94: Part E: Time Interval of stored dat
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Page 97 and 98: on the steps needed to transfer the
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
Page 115 and 116: ased on a process handle (a program
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: accomplish this have been developed
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 and 146: There are not specific valid values
Page 147 and 148: catalog list. For the DSS2GDB appli
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
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Int OperationThe Integer operation
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case that was developed for Map2Map
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contours (isohyetals) or by interpo
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design storm input given its possib
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Figure 4.55 Workflow for Extracting
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for it. Finally, the DigitalStorm2H
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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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