<div dir="ltr">Hi Maning,<div><br></div><div>For NAD83 you need to convert the Datum to WGS84. The WKT string you show does not include that conversion. Proj.4 is missing these in a lot of cases.</div><div><br></div><div>Try this string instead:</div><div><pre style="overflow:auto;font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:13.6px;margin-top:0px;margin-bottom:16px;font-stretch:normal;line-height:1.45;padding:16px;border-radius:3px;word-wrap:normal;color:rgb(51,51,51);background-color:rgb(247,247,247)"><code style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:13.6px;padding:0px;margin:0px;border-radius:3px;word-break:normal;border:0px;display:inline;max-width:initial;overflow:initial;line-height:inherit;word-wrap:normal;background:transparent">PROJCS["NAD83_California_zone_5_ftUS",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137,298.257222101]],</code><span style="color:rgb(24,54,145);font-size:12px;line-height:16.8px;background-color:rgb(255,255,255)">TOWGS84[-0.9956,1.9013,0.5215,0.025915,0.009426,0.011599,-0.00062],</span><span style="font-size:13.6px;line-height:inherit;background-color:transparent">PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["standard_parallel_1",35.46666666666667],PARAMETER["standard_parallel_2",34.03333333333333],PARAMETER["latitude_of_origin",33.5],PARAMETER["central_meridian",-118],PARAMETER["false_easting",6561666.667],PARAMETER["false_northing",1640416.667],UNIT["Foot_US",0.30480060960121924]]</span></pre>Hopefully that works for you. Let me know if it doesn't.<br><br>Daniel Fenton<br>Software Engineer<br>Esri R&D<br></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Feb 8, 2016 at 6:56 AM maning sambale <<a href="mailto:emmanuel.sambale@gmail.com" target="_blank">emmanuel.sambale@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
I'm trying to convert LA City building data from State Plane to EPSG:4326.<br>
I converted the data using ogr2ogr.  Visually inspecting using Bing<br>
imagery, I'm seeing an offset.<br>
<br>
Details of SRS info and sample images here:<br>
<a href="https://gist.github.com/maning/093a866fd465ea880032" rel="noreferrer" target="_blank">https://gist.github.com/maning/093a866fd465ea880032</a><br>
<br>
It is possible that Bing has the offset, but the source of Bing comes<br>
from LARIAC (Los Angeles Region Imagery Acquisition Consortium)<br>
imagery, the same source as the building footprints were traced.<br>
<br>
Any hints on the "proper" conversion from State Plane to EPSG:4326.<br>
<br>
--<br>
cheers,<br>
maning<br>
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