<div dir="ltr">Thank you kindly, Bob. Did you use gdal2tiles.py or is there another utility you like better?</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jan 29, 2013 at 1:08 PM, Basques, Bob (CI-StPaul) <span dir="ltr"><<a href="mailto:bob.basques@ci.stpaul.mn.us" target="_blank">bob.basques@ci.stpaul.mn.us</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Paul,<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">For reference, I’m looking at a layer here for the City, about 56sq mi coverage at 6in pxels. Using Jpeg tiles, 1000x1000pxels (500x500 ground units).<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Keep in mind that the City is not a rectangle . . . but the levels break down like so:<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">(L0) ~27,000 tiles = 1.5 GB<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">(L1) ~ 4500 tiles = 420MB<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">(L2) ~ 1140 Tiles = 123MB<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">(L3) ~ 293 tiles = 35MB<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">(L4) ~ 83 tiles = 9.4MB<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">(L5) ~ 28 tiles = 2.5MB<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">These were generated from MRSID files originally, so I can’t give you a number on disksize, since MRSIDs are basically compiled Pyramids to begin with. I have some other layers
that started as flat rasters such as your TIFFs if you want me to put something together for those, let me know.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Bobb<u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:geomoose-users-bounces@lists.osgeo.org" target="_blank">geomoose-users-bounces@lists.osgeo.org</a> [mailto:<a href="mailto:geomoose-users-bounces@lists.osgeo.org" target="_blank">geomoose-users-bounces@lists.osgeo.org</a>]
<b>On Behalf Of </b>Paul Wickman<br>
<b>Sent:</b> Tuesday, January 29, 2013 11:28 AM<br>
<b>To:</b> Brent Fraser<br>
<b>Cc:</b> <a href="mailto:geomoose-users@lists.osgeo.org" target="_blank">geomoose-users@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [Geomoose-users] Estimating tile size<u></u><u></u></span></p>
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<p class="MsoNormal">Yes, bytes. Zowie... I have a TIFF of an air photo for one of our other municipalities (also 6-inch resolution), which is 20 GB (uncompress). That coverage is only ~40 square miles. So, for a single ~800 square mile county also at
6-inch resolution I'd potentially be looking at 400 GB for the uncompressed source or... somewhere on the order of ~800 GB tiled? Does that sound right?<u></u><u></u></p>
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<p class="MsoNormal">Anybody from MnGeo on this list with any input?<u></u><u></u></p>
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<p class="MsoNormal">On Tue, Jan 29, 2013 at 11:15 AM, Brent Fraser <<a href="mailto:bfraser@geoanalytic.com" target="_blank">bfraser@geoanalytic.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Do you mean how many bytes?<br>
<br>
Looking at my Landsat tile pyramids (levels 4 to 12), they're about the same number of bytes (hmm, I expected them to be double...)<br>
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But my source images:<br>
- no compression on existing files (tiffs, e.g not jpeg)<br>
- 3 band (color) imagery<br>
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The resulting tiles:<br>
- compressed PNGs<br>
- four bands (one alpha channel for transparency)<br>
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So my guess is somewhere between "same size" to "double the number of bytes" (unless the source imagery is compressed, then it will be 5 to 10 times larger)<br>
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<pre>Best Regards,<u></u><u></u></pre>
<pre>Brent Fraser<u></u><u></u></pre>
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<p class="MsoNormal">On 1/28/2013 5:53 PM, Paul Wickman wrote:<u></u><u></u></p>
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<p class="MsoNormal">Greetings, <u></u><u></u></p>
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<p class="MsoNormal">I know this type of question goes around often in various flavors. Difficult to estimate exact size of rendered tiles, but thought I'd try to get some opinions.<u></u><u></u></p>
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<p class="MsoNormal">I see this questions asked in a variety of ways and I know it's not exactly precise on how to get the answer, but I'll throw my question out to see what I get ;)<u></u><u></u></p>
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<p class="MsoNormal">We have a client who would like us to tile and serve up high-resolution aerial photography that they own. The area is about 800 square miles and the imagery is 6-inch resolution. They'd like to be able to view the imagery at zoom levels
11 through 20 (with level 20 being 1 pixel=6 inches). Is there any way at all to determine how large a resulting raster tile set might be?<u></u><u></u></p>
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<p class="MsoNormal">Many thanks,<u></u><u></u></p>
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<p class="MsoNormal"> Paul<u></u><u></u></p>
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<p class="MsoNormal">-- <br>
Paul Wickman<br>
CTO | Flat Rock Geographics<br>
<a href="tel:612.280.5850" target="_blank">612.280.5850</a> | <a href="mailto:paul@flatrockgeo.com" target="_blank">paul@flatrockgeo.com</a><br>
<a href="http://www.flatrockgeo.com" target="_blank">www.flatrockgeo.com</a> | <a href="http://twitter.com/flatrockgeo" target="_blank">
twitter.com/flatrockgeo</a> <u></u><u></u></p>
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<p class="MsoNormal">-- <br>
Paul Wickman<br>
CTO | Flat Rock Geographics<br>
<a href="tel:612.280.5850" value="+16122805850" target="_blank">612.280.5850</a> | <a href="mailto:paul@flatrockgeo.com" target="_blank">paul@flatrockgeo.com</a><br>
<a href="http://www.flatrockgeo.com" target="_blank">www.flatrockgeo.com</a> | <a href="http://twitter.com/flatrockgeo" target="_blank">
twitter.com/flatrockgeo</a> <u></u><u></u></p>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br>Paul Wickman<br>CTO | Flat Rock Geographics<br>612.280.5850 | <a href="mailto:paul@flatrockgeo.com" target="_blank">paul@flatrockgeo.com</a><br><a href="http://www.flatrockgeo.com" target="_blank">www.flatrockgeo.com</a> | <a href="http://twitter.com/flatrockgeo" target="_blank">twitter.com/flatrockgeo</a>
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