Initial commit
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Emery Hemingway
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# Mesh line-of-sight estimations
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This repository contains data for rough line-of-sight analysis of radio sites.
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To analyze a site, create a '*.qth' file and run the `tup` utility in the repo.
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The current analysis parameters are very rough guesses and over-estimates,
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please consult the documentation of SPLAT! before tweaking them.
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## Dependecies
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* [Tup](https://gittup.org/tup)
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* [SPLAT!](https://www.qsl.net/kd2bd/splat.html)
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* [GraphicsMagick](http://www.graphicsmagick.org/)
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## TODO
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- Use recent LIDAR [data](http://www.geotree.uni.edu/en/extension/iowa-lidar-mapping-project/)
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for topography rather than the 30-meter resolution [SRTM](https://en.wikipedia.org/wiki/Shuttle_Radar_Topography_Mission) data.
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## Example
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.gitignore
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!curl = |> curl -o %o |>
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!unzip = |> unzip %f |> %B
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# High-res LIDAR data is available but SPLAT! can't read it.
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# TOOD: covert .las data to .sdf
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# https://www.geotree.uni.edu/lidar/
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# !fetch-lidar = |> curl https://geotree2.geog.uni.edu/IowaLidar/%o > %o |>
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# : |> !fetch-lidar |> 06204614.las.7z
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# : |> !fetch-lidar |> 06204614.xyzi.7z
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: foreach *.7z |> 7z x %f |> %B
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# SRTM data
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!fetch-srtm = |> curl -o %o https://firmware.ardupilot.org/SRTM/North_America/%o |>
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: |> !fetch-srtm |> N41W092.hgt.zip {hgtZip}
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: foreach *hgt.zip |> !unzip |> %B
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: N41W092.hgt |> srtm2sdf %f |> 41:42:91:92.sdf {sdf}
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# Shapefiles
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## use a throwaway account
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IOWAGIS_USER = IlxJ
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IOWAGIS_PASS = e/m1QIJV@tal{>+B:_/3~9_{]
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# : |> !curl --user '$(IOWAGIS_USER):$(IOWAGIS_PASS)' https://www.iowagisdata.org/remote.php/webdav/County/Johnson/Open/%o |> fgdb_Cell_Towers.zip
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: foreach *.qth | {sdf} |> splat -o %B -t %f -L 20 -db 56 -R 8 -kml |> \
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%B.ppm %B-site_report.txt %B.kml %B.scf %B-ck.ppm
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: foreach *.ppm |> gm convert %f %o |> %B.png
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--==[ SPLAT! v1.4.2 Site Analysis Report For: forest-view ]==--
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---------------------------------------------------------------------------
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Site location: 41.6847 North / 91.5430 West (41° 41' 5" N / 91° 32' 34" W)
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Ground elevation: 731.63 feet AMSL
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Antenna height: 20.00 feet AGL / 751.63 feet AMSL
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Antenna height above average terrain: 16.55 feet
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Average terrain at 0 degrees azimuth: 763.03 feet AMSL
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Average terrain at 45 degrees azimuth: 797.90 feet AMSL
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Average terrain at 90 degrees azimuth: 773.30 feet AMSL
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Average terrain at 135 degrees azimuth: 702.91 feet AMSL
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Average terrain at 180 degrees azimuth: 656.82 feet AMSL
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Average terrain at 225 degrees azimuth: 710.43 feet AMSL
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Average terrain at 270 degrees azimuth: 732.47 feet AMSL
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Average terrain at 315 degrees azimuth: 743.72 feet AMSL
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---------------------------------------------------------------------------
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<?xml version="1.0" encoding="UTF-8"?>
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<kml xmlns="http://earth.google.com/kml/2.1">
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<!-- Generated by SPLAT! Version 1.4.2 -->
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<Folder>
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<name>SPLAT!</name>
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<description>forest-view Transmitter Contours</description>
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<GroundOverlay>
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<name>SPLAT! Signal Strength Contours</name>
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<description>SPLAT! Coverage</description>
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<Icon>
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<href>forest-view.ppm</href>
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</Icon>
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<LatLonBox>
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<north>41.99917</north>
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<south>41.00000</south>
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<east>-91.00083</east>
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<west>-92.00000</west>
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<rotation>0.0</rotation>
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</LatLonBox>
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</GroundOverlay>
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<ScreenOverlay>
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<name>Color Key</name>
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<description>Contour Color Key</description>
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<Icon>
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<href>forest-view-ck.ppm</href>
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</Icon>
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<overlayXY x="0" y="1" xunits="fraction" yunits="fraction"/>
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<screenXY x="0" y="1" xunits="fraction" yunits="fraction"/>
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<rotationXY x="0" y="0" xunits="fraction" yunits="fraction"/>
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<size x="0" y="0" xunits="fraction" yunits="fraction"/>
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</ScreenOverlay>
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<Placemark>
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<name>forest-view</name>
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<visibility>1</visibility>
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<Style>
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<IconStyle>
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<Icon>
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<href>root://icons/palette-5.png</href>
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<x>224</x>
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<y>224</y>
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<w>32</w>
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<h>32</h>
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</Icon>
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</IconStyle>
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</Style>
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<Point>
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<extrude>1</extrude>
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<altitudeMode>relativeToGround</altitudeMode>
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<coordinates>-91.542972,41.684750,20.000000</coordinates>
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</Point>
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</Placemark>
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</Folder>
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</kml>
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Binary file not shown.
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After Width: | Height: | Size: 968 KiB |
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forest-view
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41 41 5.1
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91 32 34.7
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20
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; SPLAT! Auto-generated Signal Color Definition ("forest-view.scf") File
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;
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; Format for the parameters held in this file is as follows:
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;
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; dBuV/m: red, green, blue
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;
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; ...where "dBuV/m" is the signal strength (in dBuV/m) and
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; "red", "green", and "blue" are the corresponding RGB color
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; definitions ranging from 0 to 255 for the region specified.
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;
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; The following parameters may be edited and/or expanded
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; for future runs of SPLAT! A total of 32 contour regions
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; may be defined in this file.
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;
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;
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128: 255, 0, 0
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118: 255, 165, 0
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108: 255, 206, 0
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98: 255, 255, 0
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88: 184, 255, 0
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78: 0, 255, 0
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68: 0, 208, 0
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58: 0, 196, 196
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48: 0, 148, 255
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38: 80, 80, 255
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28: 0, 38, 255
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18: 142, 63, 255
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8: 140, 0, 128
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15.000 ; Earth Dielectric Constant (Relative permittivity)
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0.005 ; Earth Conductivity (Siemens per meter)
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301.000 ; Atmospheric Bending Constant (N-units)
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5000.0 ; Frequency in MHz (5 GHz)
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5 ; Radio Climate (5 = Continental Temperate)
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1 ; Polarization (0 = Horizontal, 1 = Vertical)
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0.50 ; Fraction of situations (50% of locations)
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0.90 ; Fraction of time (90% of the time)
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4.0 ; Effective Radiated Power (ERP) in Watts (optional)
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