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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I fear I cannot help with Mapserver configuration. However, I see that you are using a geographics coordinate system (EPSG:4326) and I would like
to ask your opinion about what would be the correct distance/length display.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">See the screenshot at
<a href="http://latuviitta.org/documents/wgs84_distortion_between_60_and_70_degrees_north.png">
http://latuviitta.org/documents/wgs84_distortion_between_60_and_70_degrees_north.png</a>. The image area is roughly 15 degrees in both directions. However, as kilometers the scale is different in South-North direction than in East-West. In addition, in East-West
direction the scale is changing according to the latitude. The net area of this Landsat image in projected coordinate system (EPSG:3067) is about 1400 km (height) by 900 km (width) and in that projection the image is a rectangular box.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">With EPSG:4326 a single scale bar using miles as units just cannot work. Theoretically there could be a two-dimensional scale bar with different
scales for vertical and horizontal distances. The latitude used for computing the scale could be the center point of the map. But even then the horizontal scale would be badly wrong in the extreme North and South if the visible area is large and far from
the equator as in the sample image.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-Jukka Rahkonen-<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">David Pardy wrote:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Prior to the scalebar, I had set the projection the same per layer:</span><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> PROJECTION<br>
"proj=longlat"<br>
"ellps=WGS84"<br>
</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">"datum=WGS84"<br>
END</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">After getting the scalebar to appear, I notice the lengths/distances were not correct, so I decided to add a map projection outside all the layers. Same as above.</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">My scalebar is as follows:</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> SCALEBAR<br>
LABEL<br>
COLOR 0 0 0<br>
SIZE SMALL<br>
END<br>
STYLE 0<br>
SIZE 180 8<br>
POSITION lc<br>
COLOR 0 0 0<br>
UNITS MILES<br>
INTERVALS 2<br>
TRANSPARENT TRUE<br>
STATUS EMBED<br>
END</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Any help on the matter would be greatly appreciated.
</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
Thank you.</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:black">David</span><o:p></o:p></p>
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