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

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When HEC-HMS is called, it runs asynchronously from ArcGIS.Therefore, the HMSCaller DLL must have functionalities to pause execution ofthe geoprocessing workflow until HEC-HMS completely finishes execution andbefore returning control to ArcGIS.All external applications launched <strong>by</strong> Shell functions run asynchronously,which means that the launching application is not notified when the launchedapplication (also known as the shelled application) has finished execution. Itimplies that eventually, the next program statements in the launching application(next tool in model builder’s workflow) will continue execution before thelaunched application (HEC-HMS in this case) has completed execution.For the proposed integration to succeed, it is required that the launchingapplications or processes run in a synchronous fashion in which every process inline keeps track of the execution of the previous process and waits for it to becompleted before the next process starts executing. The ability to wait isparticularly critical for this integration because under the current integrationscheme, the output of one process becomes the input for the next process inline.Therefore, starting a process with an incomplete input configuration will generatean error and will halt the execution of the entire workflow or will propagate errorsalong the integrated components of the workflow. Thus, the integration schemeneeds to start an application using the Shell tools and wait for the shelled programto end before continuing processing and executing the next line of code.To avoid asynchronous behavior, several options can be implemented. Forthe present work, the Shell function was enhanced with delay capabilities that are104
ased on a process handle (a programmatic reference to the application currentlyexecuting, a handle on the process id). Once created, the process handle is used towait for the running object to finish execution. In practice, to wait for the externalprogram to terminate, the program may use the WaitForSingleObject API call orthe Windows Scripting Host (WSH).The programmatic options for calling an external program from VisualBasic are briefly described below. As mentioned before, for Visual Basic 6, Shellcommand is the most recommended way for interfacing with an externalapplication (if it does not provide an object library to access its functionality). Inits general syntax the code statement returns a process object id that is stored in along integer variable. The Shell command then contains the pathname of the fileto be executed and the desired style of window for the execution. An example ofthe Shell statement in Visual Basic follows.lngPID = Shell("c:\...\MyTextFile.txt", vbNormalFocus)To wait for the external program to terminate, the program might use theWaitForSingleObject API. The WaitForSingleObject uses a process handlegenerated with the previous process id of the open process (the launched externalprogram).For Visual Basic.NET, the external call operation is done through theSystem.Diagnostics namespace which has a Process class that is used to launchexternal programs. The program needs to pass in the name of an executable file ora filename with an extension associated with an executable application. Thegeneral syntax is shown bellow:105
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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
Page 63 and 64: Section line for a RAS cross-sectio
Page 65 and 66: from the geodatabase back into the
Page 67 and 68: Figure 3.19 Relationship Classes fo
Page 69 and 70: Figure 3.20 DSS Time Series content
Page 71 and 72: Figure 3.22 Extended Time Series Co
Page 73 and 74: Figure 3.23 Creating a Flow File fr
Page 75 and 76: etween the HEC-DSS file system and
Page 77 and 78: The more specific steps for the pos
Page 79 and 80: Chapter 4 Map2Map Components4.1 MOD
Page 81 and 82: 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: Figure 4.12 HMSCaller Model Compone
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
Page 135 and 136: straight forward for all time stamp
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
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data structures delivered by every
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The two most well-known models for
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The water surface elevations obtain
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Once the water surface elevations f
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Generate a suitable water surface m
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Figure 4.42 2 Foot-Contour Lines fo
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Figure 4.43 Rosillo Creek’s terra
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standard ArcGIS tool), is used in M
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By doing this, the water surface el
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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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