Le portail francophone de la géomatique

BOYER.M · Thu 23 November 2017 09:33

Bonjour,

On m'a envoyé un fichier .vrt est il possible de l'ouvrir et le visualiser sur qgis sans avoir les images rasters d'origine ?

Cordialement,

nico-29 · Thu 23 November 2017 09:51

Bonjour,

Un fichier .vrt est en fait un fichier xml qui stocke les caractéristiques des tuiles raster et les liens vers ces tuiles (voir balise ComplexSource dans l'exemple ci-dessous).
Donc il faut avoir les tuiles d'origine.

Exemple de fichier vrt:

Code:

<VRTDataset rasterXSize="27000" rasterYSize="25000">
  <SRS>PROJCS["RGF93_Lambert_93",GEOGCS["GCS_RGF_1993",DATUM["Reseau_Geodesique_Francais_1993",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic_2SP"],PARAMETER["False_Easting",700000.0],PARAMETER["False_Northing",6600000.0],PARAMETER["Central_Meridian",3.0],PARAMETER["Standard_Parallel_1",44.0],PARAMETER["Standard_Parallel_2",49.0],PARAMETER["Latitude_Of_Origin",46.5],UNIT["Meter",1.0]]</SRS>
  <GeoTransform> 8.4997500000000000e+004, 5.0000000000000000e+000, 0.0000000000000000e+000, 6.8760025000000000e+006, 0.0000000000000000e+000,-5.0000000000000000e+000</GeoTransform>
  <VRTRasterBand dataType="Float32" band="1">
    <Metadata>
      <MDI key="STATISTICS_MAXIMUM">154.89999389648</MDI>
      <MDI key="STATISTICS_MEAN">13.554121093924</MDI>
      <MDI key="STATISTICS_MINIMUM">-103.05000305176</MDI>
      <MDI key="STATISTICS_STDDEV">45.28775398041</MDI>
    </Metadata>
    <NoDataValue>-99999</NoDataValue>
    <Histograms>
      <HistItem>
        <HistMin>-103.1789780502319</HistMin>
        <HistMax>155.0289688949585</HistMax>
        <BucketCount>1000</BucketCount>
        <IncludeOutOfRange>0</IncludeOutOfRange>
        <Approximate>1</Approximate>
        <HistCounts>5|103|66|102|161|172|181|90|73|39|4|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|2|13|18|34|118|271|389|407|462|459|493|634|788|955|1446|954|1044|888|902|976|1016|864|916|919|820|791|688|667|641|753|915|959|929|760|730|701|619|661|584|560|526|478|475|376|440|386|414|405|448|449|398|443|430|425|379|346|419|439|532|533|454|382|373|311|268|236|204|201|202|181|155|154|139|115|109|108|112|108|90|73|59|64|54|46|60|48|43|48|35|59|88|212|427|637|694|1059|1542|2154|2291|2626|2436|2377|2423|2517|2527|2237|2157|1870|1554|1380|1274|1083|1190|1218|1319|1413|1446|1509|1505|1624|1689|1816|1812|2011|1855|1813|1584|1562|1572|1786|1735|1755|1815|1906|2244|2107|1583|1287|1376|1354|1499|1538|1594|1814|1740|1915|1911|2275|2496|2657|2695|2792|2678|2571|2517|2416|2184|2112|2049|1894|1836|1586|1662|1526|1404|1382|1356|1278|1321|1407|1345|1505|1389|1594|1482|1402|1442|1949|2165|2417|1913|1593|1545|1414|1442|1512|1605|1701|2434|3439|6723|8861|8364|7596|7461|7979|9851|8774|6038|4387|3278|3043|3091|3323|4003|3611|3299|2402|2108|2308|2051|1765|1747|2185|2388|2369|2608|3073|3398|2518|2078|2180|2512|3242|4512|4910|6115|5814|4403|3835|3119|5831|2274|2120|2513|2791|1929|1779|1676|1348|1231|1285|1104|1081|1095|1021|994|1243|1665|2295|1883|1579|5819|2088|1824|1084|1192|1821|2370|2619|3211|3409|3093|2353|1248|855|687|706|684|658|604|735|914|1160|1302|1396|1709|1875|1948|2256|2216|1738|1531|1535|1421|1518|1393|1336|1464|1471|1605|1604|1666|1782|1795|1895|2235|2645|2538|2034|1673|1292|1330|1490|1493|1606|1449|1418|1636|1602|1428|1183|847|836|855|840|799|763|681|737|764|612|589|635|718|787|672|626|616|671|614|507|428|365|343|277|272|330|357|409|334|388|434|426|461|419|422|343|204|186|208|184|160|173|161|158|154|120|129|166|131|165|126|146|175|188|220|182|201|243|224|222|248|216|250|203|205|229|214|184|204|215|173|173|168|154|192|183|193|200|226|260|254|283|305|387|445|496|487|465|505|552|579|547|531|543|529|516|574|631|596|663|575|645|829|787|811|862|835|823|787|814|861|747|704|721|721|691|664|626|644|643|666|638|635|651|638|637|632|660|653|680|675|711|677|748|744|868|906|878|908|986|1000|1103|1046|923|939|979|969|1057|1080|1075|981|1070|1129|1133|1204|1294|1356|1498|1570|1762|2059|2044|1631|1499|1506|1489|1372|1369|1455|1692|1491|1427|1396|1354|1566|1606|1578|1623|1716|1812|1826|1781|1698|1487|1274|1162|1059|962|953|1008|960|1040|947|996|913|920|913|860|840|826|807|859|831|930|986|917|909|935|1007|1274|1372|1185|1069|1240|1188|1204|1178|1187|1259|1303|1241|1250|1199|1181|1315|1169|1164|1115|1219|1187|1167|1140|1145|1144|1343|1615|1552|1323|1127|1140|1047|1147|1130|1133|1114|1055|1120|1126|1137|1101|1474|1432|1344|1194|774|584|547|660|627|596|515|514|506|484|449|449|500|496|465|468|541|511|515|492|539|586|511|476|393|365|326|169|117|109|126|109|113|131|124|113|105|105|106|103|103|121|138|134|119|136|139|142|149|159|157|155|155|143|144|151|152|150|160|134|167|137|146|153|140|123|142|141|123|131|118|106|117|119|114|113|119|106|137|133|135|151|116|109|90|94|84|111|130|123|131|144|123|102|89|114|94|95|107|95|104|94|83|68|63|71|72|78|96|86|79|68|73|78|86|80|76|86|79|107|101|92|95|91|75|108|86|117|91|91|119|102|108|100|109|100|115|102|116|119|109|117|123|143|138|143|148|146|150|156|195|175|233|224|232|257|254|268|231|266|254|271|288|315|285|320|303|319|316|320|290|303|264|281|278|257|262|241|249|262|234|244|225|224|232|223|213|212|193|201|208|200|201|213|215|223|185|213|191|207|183|203|205|206|213|204|240|225|206|209|223|207|209|208|189|195|193|202|198|202|209|212|185|207|179|195|176|200|205|185|190|187|198|204|210|194|194|210|202|152|160|202|234|217|195|200|189|193|185|187|269|178|154|124|103|97|90|75|66|64|78|81|74|79|71|55|42|31|25|21|24|21|12|17|9|9|2</HistCounts>
      </HistItem>
    </Histograms>
    <ComplexSource>
      <SourceFilename relativeToVRT="0">C:\data\MNT5m/LITTO3D_FRA_0085_6832_MNT5_20141222_LAMB93_RGF93_IGN69.asc</SourceFilename>
      <SourceBand>1</SourceBand>
      <SourceProperties RasterXSize="200" RasterYSize="200" DataType="Float32" BlockXSize="200" BlockYSize="1" />
      <SrcRect xOff="0" yOff="0" xSize="200" ySize="200" />
      <DstRect xOff="0" yOff="8800" xSize="200" ySize="200" />
      <NODATA>-99999</NODATA>
    </ComplexSource>
    <ComplexSource>
      <SourceFilename relativeToVRT="0">C:\data\MNT5m/LITTO3D_FRA_0085_6833_MNT5_20141222_LAMB93_RGF93_IGN69.asc</SourceFilename>
      <SourceBand>1</SourceBand>
      <SourceProperties RasterXSize="200" RasterYSize="200" DataType="Float32" BlockXSize="200" BlockYSize="1" />
      <SrcRect xOff="0" yOff="0" xSize="200" ySize="200" />
      <DstRect xOff="0" yOff="8600" xSize="200" ySize="200" />
      <NODATA>-99999</NODATA>
    </ComplexSource>

Nico

BOYER.M · Thu 23 November 2017 10:11

Merci, c'est bien ce qu'il me semblait, or je n'ai pas les tuiles d'origines.

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Le portail francophone de la géomatique

Annonce

#1 Thu 23 November 2017 09:33

QGIS 2.16.0: Ouvrir un fichier .vrt

#2 Thu 23 November 2017 09:51

Re: QGIS 2.16.0: Ouvrir un fichier .vrt

Code:

#3 Thu 23 November 2017 10:11

Re: QGIS 2.16.0: Ouvrir un fichier .vrt

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