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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">Frank and the List,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">I have a geodetic problem I hope GDAL/OGR can solve.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">The setup:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">I have two radio towers each the same height and at the same elevation being 10,000 meters apart. I know the latitude and longitude of the first tower and those
coordinates reference WGS84 (though they could be any geographic CRS, NAD27, NAD83, etc.). I also now the baring to the second from the first measured from true north at the first tower.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">The problem:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">Given the above information and using the prebuilt tools, GDAL/OGR utilities, what workflow would one use to calculate the latitude and longitude of the second
tower?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">The hints I have gotten so far say to use a conformal projection (UTM maybe?) centered at the first point with a scale factor of 1, a local projection. Calculate
the Cartesian offsets from the first point to the second based on the azimuth of the given baring. Using the baring calculate the x and y offsets to the second point and use offsets to find the x and y of the second point in the local coordinate system.
Then, reproject the x and y of the second point to the latitude and longitude in the CRS of the first points latitude and longitude. If this is correct, I guess the question is, what would the proj4 parameters be for such a local projections.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">David<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">David M. Bake<b>r<o:p></o:p></b></span></i></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">Senior Geologist - Chief Technology Advisor<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">Chesapeake Energy Corporation<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">405-935-3715 office<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black">405-496-5373 cell<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:black"><a href="mailto:david.m.baker@chk.com">david.m.baker@chk.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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