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introgis [2019/11/12 17:15]
qcbs [Exercise 6 - Using GRASS with QGIS Processing toolbox]
introgis [2019/11/12 17:17] (current)
qcbs [Exercice 4 - Downloading files, recap and challenge!]
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 **CHALLENGE 2**: Regenerate your interpolated raster maps for each time periods using the Multi-level B-Spline Interpolation tool in Saga. Use the Processing toolbox for this. Compare those maps with the ones you obtained with Inverse Distance Weighting. ​ **CHALLENGE 2**: Regenerate your interpolated raster maps for each time periods using the Multi-level B-Spline Interpolation tool in Saga. Use the Processing toolbox for this. Compare those maps with the ones you obtained with Inverse Distance Weighting. ​
 ====== Exercice 4 - Downloading files, recap and challenge! ====== ====== Exercice 4 - Downloading files, recap and challenge! ======
-For this exercise, you will need to extract the mean elevation and the land cover at occurence sites of the [[http://​www.gbif.org/​|Global Biodiversity Information Facility (GBIF)]] falling within the Wemindji aboriginal territory, in the James Bay area of Quebec. **You will want to work with the UTM Zone 17N / NAD83 reference system**. Note that to reproject a raster, the preferred way is to use Raster>​Projections>​Warp.To achieve the objective, you will need to complete the following steps: ​+For this exercise, you will need to extract the mean elevation and the land cover at occurence sites of the [[http://​www.gbif.org/​|Global Biodiversity Information Facility (GBIF)]] falling within the Wemindji aboriginal territory, in the James Bay area of Quebec. **You will want to work with the UTM Zone 17N / NAD83 reference system**. Note that to reproject a raster, the preferred way is to use Raster>​Projections>​Warp. To achieve the objective, you will need to complete the following steps: ​
  
   * On the [[https://​open.canada.ca/​en/​open-data|Canada Open Government]] website, download raster [[http://​ftp.geogratis.gc.ca/​pub/​nrcan_rncan/​elevation/​cdem_mnec/​|elevation files]] for zones 33D and 33E at the 1:250,000 scale.   * On the [[https://​open.canada.ca/​en/​open-data|Canada Open Government]] website, download raster [[http://​ftp.geogratis.gc.ca/​pub/​nrcan_rncan/​elevation/​cdem_mnec/​|elevation files]] for zones 33D and 33E at the 1:250,000 scale.
   * Download this {{::​qc_land_use_33de.zip|ZIP package}} containing a tif file with a recent land cover classification of the area and the associated style/​colormap in qml format. ​   * Download this {{::​qc_land_use_33de.zip|ZIP package}} containing a tif file with a recent land cover classification of the area and the associated style/​colormap in qml format. ​
-  * On the MERN website (https://​mern.gouv.qc.ca/​territoire/​portrait/​portrait-donnees-mille.jsp),​ download the "Municipalités,​ TNO et territoires autochtones", "​Municipalités,​ TNO et territoires autochtones"​ dataset as a shapefile. You will want the polygon layer. ​+  * On the MERN website (https://​mern.gouv.qc.ca/​territoire/​portrait/​portrait-donnees-mille.jsp),​ download the "Découpages administratifs", "​Municipalités,​ TNO et territoires autochtones"​ dataset as a shapefile. You will want the polygon layer. ​
   * Download {{::​occurrence.txt|this file}} containing the [[http://​www.gbif.org/​|GBIF]] species occurences in the Wemindji region. Note that this file is TAB delimited and the coordinates are in Latitude, longitude (WGS84). You can open it in a text editor to explore it's content. ​   * Download {{::​occurrence.txt|this file}} containing the [[http://​www.gbif.org/​|GBIF]] species occurences in the Wemindji region. Note that this file is TAB delimited and the coordinates are in Latitude, longitude (WGS84). You can open it in a text editor to explore it's content. ​
   * Using the latitude, longitude coordinates,​ add the GBIF occurences to the map canvas (it is TAB delimited). ​   * Using the latitude, longitude coordinates,​ add the GBIF occurences to the map canvas (it is TAB delimited). ​
   * Merge the elevation raster layers (.tif) into one using Raster>​Miscellaneous>​Merge. Save the output as a .tif file.    * Merge the elevation raster layers (.tif) into one using Raster>​Miscellaneous>​Merge. Save the output as a .tif file. 
-  * Use a filter to isolate the Wemindji territory (MUS_MN_MUN column). ​+  * Use a filter to isolate the Wemindji territory (MUS_MN_MUN column)from the municipalities layer
   * Clip the occurrences to obtain only those within the Wemindji territory. ​   * Clip the occurrences to obtain only those within the Wemindji territory. ​
   * Use the 'point sampling tool' plugin to extract the name of each species in latin, the land cover and the elevation at each occurrence location. Note that some locations contain a large number of occurrences. ​   * Use the 'point sampling tool' plugin to extract the name of each species in latin, the land cover and the elevation at each occurrence location. Note that some locations contain a large number of occurrences. ​