english:

                                 

 

3.4.1.2 Polar Grid

     Polar receptor networks are defined by use of the GRIDPOLR keyword.  The GRIDPOLR keyword may also be thought of as a "sub‑pathway," in that there are a series of secondary keywords that are used to define the start and the end of the inputs for a particular network, and to select the options for defining the receptor locations that make up the network.  The syntax and type of the GRIDPOLR keyword are summarized below:

Syntax:

RE GRIDPOLR Netid  STA

                   ORIG  Xinit  Yinit,

               or  ORIG  Srcid

                   DIST  Ring1  Ring2  Ring3 ...  Ringn

                   DDIR  Dir1   Dir2   Dir3 ...  Dirn,

               or  GDIR  Dirnum Dirini Dirinc

                   ELEV  Dir  Zelev1  Zelev2 Zelev3  ...  Zelevn

                   FLAG  Dir  Zflag1  Zflag2 Zflag3  ...  Zflagn

                   END

Type:

Optional, Repeatable

where the parameters are defined as follows:

Netid

Receptor network identification code (up to eight alphanumeric

  characters)

STA

Indicates STArt of GRIDPOLR inputs for a particular network,

  repeat for each new Netid

ORIG

Xinit

Yinit

Srcid

Keyword to specify the origin of the polar network (optional)

x‑coordinate for origin of polar network

y‑coordinate for origin of polar network

Source ID of source used as origin of polar network

DIST

Ring1

Ringn

Keyword to specify distances for the polar network

Distance to the first ring of polar coordinates

Distance to the 'nth' ring of polar coordinates

DDIR

 

Dir1

Dirn

Keyword to specify discrete direction radials for the

  polar network

First direction radial in degrees (1 to 360)

The 'nth' direction radial in degrees (1 to 360)

GDIR

 

Dirnum

Dirini

Dirinc

Keyword to specify generated direction radials for

  the polar network

Number of directions used to define the polar system

Starting direction of the polar system

Increment (in degrees) for defining directions

ELEV

Dir

Zelev

Keyword to specify that receptor elevations follow (optional)

Indicates which direction is being input

An array of receptor terrain elevations for a

  particular direction radial (default units of meters may be

  changed to feet by use of RE ELEVUNIT or CO ELEVUNIT keyword),

  number of entries per radial equals the number of distances for

  that network

FLAG

 

Dir

Zflag

Keyword to specify that flagpole receptor heights

  follow (optional)

Indicates which direction is being input

An array of receptor heights above local terrain

  elevation for a particular direction (flagpole

  receptors)

END

Indicates END of GRIDPOLR subpathway, repeat for each

  new Netid

     The ORIG secondary keyword is optional for the GRIDPOLR inputs.  If omitted, the model assumes a default origin of (0.,  0.,) in x,y coordinates.  The ELEV and FLAG keywords are also optional inputs, and are only needed if elevated terrain or flagpole receptor heights are to be used.  If the ELEV keyword is used and the model is being run with the flat terrain option (see Section 3.2.6), then the elevated terrain height inputs will be ignored by the model, and a non‑fatal warning message will be generated.  If the elevated terrain option is selected, and no elevated terrain heights are entered, the elevations will default to 0.0 meters, and warning messages will also be generated.  The model handles flagpole receptor height inputs in a similar manner.

     The Row parameter on the ELEV and FLAG inputs may be entered as either the row number, i.e., 1, 2, etc., or as the actual y‑coordinate value, e.g., ‑500., ‑250., etc. in the example above.  The model sorts the inputs using Row as the index, so the result is the same.  The above example could therefore be entered as follows, with the same result:

RE GRIDCART CAR1 STA

                 XPNTS  ‑500.  ‑400.  ‑200.  ‑100.  100.  200.  400.  500.

                 YPNTS  ‑500.  ‑250.   250.  500.

                 ELEV  ‑500.  8*10.

                 FLAG  ‑500.  8*10.

                 ELEV  ‑250.  8*20.

                 FLAG  ‑250.  8*20.

                 ELEV   250.  8*30.

                 FLAG   250.  8*30.

                 ELEV   500.  8*40.

                 FLAG   500.  8*40.

RE GRIDCART CAR1 END

31

Of course, one must use either the row number or y‑coordinate value consistently within each network to have the desired result.

     The following simple example illustrates the use of the XYINC secondary keyword to generate a uniformly spaced Cartesian grid network.  The resulting grid is 11 x 11, with a uniform spacing of 1 kilometer (1000. meters), and is centered on the origin (0., 0.).  No elevated terrain heights or flagpole receptor heights are included in this example.

RE GRIDCART CG1 STA

                XYINC  ‑5000.  11  1000.  ‑5000.  11 1000.

RE GRIDCART CG1 END

32

 

 

201 - 202 - 203 - 204 - 205 - 206 - 207 - 208 - 209 - 210 - 211 - 212 - 213 - 214 - 215 - 216 - 217 - 218 - 219 - 220 - 221 - 222 - 223 - 224 - 225 - 226 - 227 - 228 - 229 - 230 - 231 - 232 - 233 - 234 - 235 - 236 - 237 - 238 - 239 - 240 - 241 - 242 - 243 - 244 - 245 - 246 - 247 - 248 - 249 - 250

 

 

      Flag of Portugal 

 

 castellano:     italiano:     

 

 français:    português:  

 

deutsch:

 

castellano: DIS CUS DES  RAD   english: DIS CUS DES RAD  

 

 português: DIS CUS DES RAD   italiano:   DIS CUS  DES RAD

 

français:  DIS CUS DES RAD