<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body><div>We have a custom tiling scheme (tilematrixset) for satellite imagery that varies tile widths as they move closer/farther from the equator. We do this for speed/efficiency reasons and the amount of error introduced is minimal over short distances and doesn't impat running CV algorithms. However, this means that our tiles may differ in width by a pixel for a paritcular satellite image (we tile the images). <br></div><div><br></div><div>Using gdalbuildvirt to combine the tiles back into a single image works fine.<br></div><div><br></div><div>However, we would like to serve them using the OGC tile api. And that doesn't work, due to this error:<br></div><div><br></div><blockquote><div><span style='color: rgb(29, 28, 29); font-family: Monaco, Menlo, Consolas, "Courier New", monospace; font-size: 12px; font-style: normal; font-variant-ligatures: none; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgba(29, 28, 29, 0.04); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;'>ERROR 1: GDALWMS: Incorrect size 983 x 1232 of downloaded block, expected 982 x 1232, max 982 x 1232.
ERROR 1: GDALWMS: ReadBlockFromFile (0.0.0.0:5500/ogcapi/collections/1050010019917900---s---WV02---wv02---NA---NA/map/tiles/C1232_180_180/0/0/1.tif) failed.
ERROR 1: GDAL_WMS>, band 1: IReadBlock failed at X offset 0, Y offset 0: GDALWMS: ReadBlockFromFile (0.0.0.0:5500/ogcapi/collections/1050010019917900---s---WV02---wv02---NA---NA/map/tiles/C1232_180_180/0/0/1.tif) failed.</span><br></div><div><br></div></blockquote><div><br></div><div>The code that causes this is:<br></div><div><span style='color: rgb(29, 28, 29); font-family: Monaco, Menlo, Consolas, "Courier New", monospace; font-size: 12px; font-style: normal; font-variant-ligatures: none; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgba(29, 28, 29, 0.04); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;'></span><br></div><div><br></div><blockquote><span style='color: rgb(29, 28, 29); font-family: Monaco, Menlo, Consolas, "Courier New", monospace; font-size: 12px; font-style: normal; font-variant-ligatures: none; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgba(29, 28, 29, 0.04); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;'></span><div style="background-color:#ffffff;color:#080808"><pre style="font-family:'JetBrains Mono',monospace;font-size:9.8pt;"><span style="color: rgb(140, 140, 140);"><i></i></span><br></pre><pre style="font-family:'JetBrains Mono',monospace;font-size:9.8pt;"><span style="color: rgb(140, 140, 140);"><i>/* expected size */<br></i></span><span style="color:#0033b3;">const int </span><span style="color:#000000;">esx </span>= <span style="color: rgb(31, 84, 46);"><b>MIN</b></span>(MAX(<span style="color:#1750eb;">0</span>, (<span style="color:#000000;">x </span>+ <span style="color:#1750eb;">1</span>) * <span style="color:#660e7a;">nBlockXSize</span>), <span style="color:#660e7a;">nRasterXSize</span>) -<div><br></div> <span style="color: rgb(31, 84, 46);"><b>MIN</b></span>(MAX(<span style="color:#1750eb;">0</span>, <span style="color:#000000;">x </span>* <span style="color:#660e7a;">nBlockXSize</span>), <span style="color:#660e7a;">nRasterXSize</span>);<div><br></div><span style="color:#0033b3;">const int </span><span style="color:#000000;">esy </span>= <span style="color: rgb(31, 84, 46);"><b>MIN</b></span>(MAX(<span style="color:#1750eb;">0</span>, (<span style="color:#000000;">y </span>+ <span style="color:#1750eb;">1</span>) * <span style="color:#660e7a;">nBlockYSize</span>), <span style="color:#660e7a;">nRasterYSize</span>) -<div><br></div> <span style="color: rgb(31, 84, 46);"><b>MIN</b></span>(MAX(<span style="color:#1750eb;">0</span>, <span style="color:#000000;">y </span>* <span style="color:#660e7a;">nBlockYSize</span>), <span style="color:#660e7a;">nRasterYSize</span>);<div><br></div><div><br></div><span style="color:#0033b3;">int </span><span style="color:#000000;">sx </span>= <span style="color:#000000;">ds</span>->GetRasterXSize();<div><br></div><span style="color:#0033b3;">int </span><span style="color:#000000;">sy </span>= <span style="color:#000000;">ds</span>->GetRasterYSize();<br><br></pre><pre style="font-family:'JetBrains Mono',monospace;font-size:9.8pt;"><span style="color: rgb(140, 140, 140);"><i>/* Allow bigger than expected so pre-tiled constant size images work on<br></i></span><span style="color: rgb(140, 140, 140);"><i> * corners */</i></span></pre></div><span style='color: rgb(29, 28, 29); font-family: Monaco, Menlo, Consolas, "Courier New", monospace; font-size: 12px; font-style: normal; font-variant-ligatures: none; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgba(29, 28, 29, 0.04); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;'>if ((sx > nBlockXSize) || (sy > nBlockYSize) || (sx < esx) || (sy < esy))
{
CPLError(CE_Failure, CPLE_AppDefined,
"GDALWMS: Incorrect size %d x %d of downloaded block, "
"expected %d x %d, max %d x %d.",
sx, sy, esx, esy, nBlockXSize, nBlockYSize);
ret = CE_Failure;
}</span><div></div></blockquote><div><br>I was hoping that the comment about bigger than expected size images would work, but from the error message above it does not.</div><div><br></div><div>So I expect the answer is no, but is there any way we could work around, loosen or disable this restriction? Or some other idea on how to make this work?<br></div><div><br>Thanks,</div><div><br></div><div>Charlie<br></div><div><br></div><div><br></div><div><br></div><div><br></div></body></html>