Dataset Open Access

Orthophotos and DSMs/DTM derived from RPAS flights over the nature reserve Landschap De Liereman in Flanders, Belgium

Vanden Borre, Jeroen; Klaas Pauly; Van Hoey, Stijn; De Reu, Jeroen; Desmet, Peter

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  <identifier identifierType="DOI">10.5281/zenodo.3063335</identifier>
      <creatorName>Vanden Borre, Jeroen</creatorName>
      <familyName>Vanden Borre</familyName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="">0000-0002-0153-7243</nameIdentifier>
      <affiliation>Research Institute for Nature and Forest (INBO)</affiliation>
      <creatorName>Klaas Pauly</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="">0000-0002-2183-1917</nameIdentifier>
      <affiliation>Flemish Institute for Technological Research (VITO)</affiliation>
      <creatorName>Van Hoey, Stijn</creatorName>
      <familyName>Van Hoey</familyName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="">0000-0001-6413-3185</nameIdentifier>
      <affiliation>Research Institute for Nature and Forest (INBO)</affiliation>
      <creatorName>De Reu, Jeroen</creatorName>
      <familyName>De Reu</familyName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="">0000-0001-9454-0021</nameIdentifier>
      <affiliation>Research Institute for Nature and Forest (INBO)</affiliation>
      <creatorName>Desmet, Peter</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="">0000-0002-8442-8025</nameIdentifier>
      <affiliation>Research Institute for Nature and Forest (INBO)</affiliation>
    <title>Orthophotos and DSMs/DTM derived from RPAS flights over the nature reserve Landschap De Liereman in Flanders, Belgium</title>
    <subject>digital surface model</subject>
    <subject>remote sensing</subject>
    <subject>nature management</subject>
    <date dateType="Issued">2019-06-17</date>
  <resourceType resourceTypeGeneral="Dataset"/>
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    <rights rightsURI="">Creative Commons Zero v1.0 Universal</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
    <description descriptionType="Abstract">&lt;p&gt;&lt;strong&gt;Study area&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;Landschap De Liereman is a nature reserve situated in Oud-Turnhout, in the province of Antwerp, Flanders, Belgium. The area is managed by the nature conservation NGO Natuurpunt and consists of a diverse landscape of wet and dry heathlands, &lt;em&gt;Nardus&lt;/em&gt; grasslands on siliceous soils, forests and transition mires, as well as some remaining arable fields and high-intensity agricultural grasslands.&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;Data collection&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;Data were collected by the &lt;a href=""&gt;Research Institute for Nature and Forest (INBO)&lt;/a&gt; with a fixed wing drone Gatewing X100 in 2015 (7 flights). RGB data were acquired using an off-the-shelf Ricoh GR Digital IV camera, with the following image bands: 1: red, 2: green, 3: blue, 4: alpha channel.&lt;/p&gt;

&lt;p&gt;An additional flight campaign was commissioned by INBO and carried out by the &lt;a href=""&gt;Flemish Institute for Technological Research (VITO)&lt;/a&gt; in 2017 with a fixed wing drone SenseFly eBee. Multispectral data were acquired using a Parrot Sequoia camera, with the following image bands: 1: green, 2: red, 3: red edge, 4: NIR, 5: alpha channel. with a Parrot Sequoia camera. Raw data for this flight campaign are not available.&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;Data processing&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;The raw data were processed to Digital Surface Models and orthophotos by VITO in 2017. For the 2017 campaign by VITO, the outputs also include a Digital Terrain Model (DTM). Images with coarse GPS coordinates were imported and processed in Agisoft PhotoScan Pro 1.4.x, a structure-from-motion (SfM) based photogrammetry software program. After extraction and matching of tie points, a bundle adjustment leads to a sparse point cloud and a refined set of camera position and orientation values. From there, a point cloud densification and classification into ground and non-ground points was performed, leading to a rasterized digital surface model (DSM) and digital terrain model (DTM). Finally, a true orthomosaic was projected onto the DTM.&lt;/p&gt;

&lt;p&gt;&lt;strong&gt;Coordinate reference system&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;All geospatial data have the coordinate reference system &lt;code&gt;EPSG:31370 - Belgian Lambert 72&lt;/code&gt;.&lt;/p&gt;


	&lt;li&gt;&lt;strong&gt;Raw flight data&lt;/strong&gt;: images and logs collected by the drone during flight. These files are zipped per flight, with the date (&lt;code&gt;yyyymmdd&lt;/code&gt;) and flight number (&lt;code&gt;x&lt;/code&gt;) indicated in the file name (&lt;code&gt;;/code&gt;). Raw data for the eBee flights are not available.&lt;/li&gt;
	&lt;li&gt;&lt;strong&gt;Processed data&lt;/strong&gt;: Digital Surface Models (&lt;code&gt;filename_DSM.tif&lt;/code&gt;) and orthophotos (&lt;code&gt;filename_Ortho.tif&lt;/code&gt;) stitched together from the raw data. The included flights are indicated in the file name (7 flights for &lt;code&gt;20151008_Liereman_1-4_20151009_Liereman_1-3_DSM.tif)&lt;/code&gt;.&lt;/li&gt;
	&lt;li&gt;&lt;strong&gt;Ground control points&lt;/strong&gt;: not applicable&amp;nbsp;for this dataset.&lt;/li&gt;

&lt;p&gt;&lt;strong&gt;Cloud Optimized GeoTIFF&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;The most efficient way to explore the processed data is by loading the &lt;a href=""&gt;Cloud Optimized GeoTIFFs&lt;/a&gt; we created for each processed file. Copy one of the file URLs below and follow e.g. the &lt;a href=""&gt;QGIS tutorial&lt;/a&gt; to load this type of file.&lt;/p&gt;

	&lt;li&gt;&lt;code&gt;;/code&gt; RGB&lt;/li&gt;
	&lt;li&gt;&lt;code&gt;;/code&gt; multispec&lt;/li&gt;

&lt;p&gt;See &lt;a href=""&gt;this page&lt;/a&gt; for an overview of public INBO RPAS data.&lt;/p&gt;</description>
    <description descriptionType="Other">This dataset was collected using infrastructure provided by INBO and funded by Research Foundation - Flanders (FWO) as part of the Belgian contribution to LifeWatch.</description>
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