GeoTiles

Map - Town index - Tile index

Relevant towns and neighbourhoods

Deventer (woonkern)Oxe (buurtschap)De Bannink (buurtschap)Gorssel (woonkern)Colmschate (woonkern)Kring van Dorth (buurtschap)Epse (woonkern)Deventer (industriekern)Dortherhoek (buurtschap)Snippeling (deelkern)Joppe (woonkern)'t Amelte (gehucht)

Tile 33FN1

Actueel Hoogtebestand Nederland

Point cloud

The aerial photograph closest to the acquisition date of the AHN iteration was overlaid on the point cloud to produce a colored version for visualisation purposes. Furthermore, for each point cloud a spatial index and textual summary, including elevation histogram, are provided. Please note that the images are not from the same flight, and may be years off. Therefore, small alignment errors and differences occur between them.

Zoom in on the map to see tiled versions (25 tiles of 1×1.25 km). Tiled versions typically fit into memory (RAM) are easier to handle and are especially suitable for parallel processing and Machine Learning.

Version Point cloud Spatial index Info License
AHN1 Ground 33fn1.laz 17.7 MiB 33fn1.lax 22 kiB 33fn1.txt 12 kiB Stuurgroep AHN, public domain
Non-ground 33fn1.laz 3.9 MiB 33fn1.lax 76 kiB 33fn1.txt 13 kiB Stuurgroep AHN, public domain
Merged 33FN1.LAZ 21.6 MiB 33FN1.LAX 33 kiB 33FN1.txt 14 kiB Stuurgroep AHN (merged product by GeoTiles)
Colored Available for sub-units only, zoom in to select. Remixed by GeoTiles*
AHN2 Ground g33fn1.laz 342.3 MiB g33fn1.lax 141 kiB g33fn1.txt 6 kiB Stuurgroep AHN, public domain
Non-ground u33fn1.laz 454.4 MiB u33fn1.lax 176 kiB u33fn1.txt 17 kiB Stuurgroep AHN, public domain
Merged 33FN1.LAZ 796.7 MiB 33FN1.LAX 797 kiB 33FN1.txt 17 kiB Stuurgroep AHN (merged product by GeoTiles)
Colored Available for sub-units only, zoom in to select. Remixed by GeoTiles*
AHN3 Original C_33FN1.LAZ 2.4 GiB C_33FN1.LAX 1.9 MiB C_33FN1.txt 27 kiB Stuurgroep AHN, public domain
Colored Available for sub-units only, zoom in to select. Remixed by GeoTiles*
AHN4 Original C_33FN1.LAZ 4.7 GiB C_33FN1.LAX 2.0 MiB C_33FN1.txt 31 kiB Het Waterschapshuis, public domain
Colored (Partially) available for sub-units. Remixed by GeoTiles*
Yearly3 2016 c_IJssel2016_33fn1.laz 6.3 MiB c_IJssel2016_33fn1.txt 10 kiB See source (Rijkswaterstaat)
2017 c_IJssel2017_33fn1.laz 7.0 MiB c_IJssel2017_33fn1.txt 10 kiB See source (Rijkswaterstaat)
2018 c_IJssel2018_33fn1.laz 4.9 MiB c_IJssel2018_33fn1.txt 10 kiB See source (Rijkswaterstaat)
2019 c_IJssel2019_33fn1.laz 4.4 MiB c_IJssel2019_33fn1.txt 10 kiB See source (Rijkswaterstaat)
2020 C_IJSSEL2020_33FN1.LAZ 3.0 MiB C_IJSSEL2020_33FN1.LAX 940 B C_IJSSEL2020_33FN1.txt 9 kiB See source (Rijkswaterstaat)

*The point cloud is in the public domain and the aerial photograph available under CC-BY. However, the colored point cloud is a new product created by GeoTiles.

3Partial coverage only.

File checksums (md5) are available for AHN1, AHN2, AHN3 and AHN4.

Raster

Version DSM DTM ('maaiveld') License
5 meter ½ meter 5 meter ½ meter
AHN1 33fn1.tif.zip public domain
AHN2 r33fn1.tif.zip ahn2_5_33fn1.tif.zip i33fn1.tif.zip public domain *
AHN3 R5_33FN1.zip R_33FN1.zip M5_33FN1.zip M_33FN1.zip CC-0
AHN4 R5_33FN1.zip R_33FN1.zip M5_33FN1.zip M_33FN1.zip CC-0 [1, 2, 3, 4]

Aerial photograph

Year Version GeoTiff Source License
2016 RGB RGB_33FN1.tiff 67.3 MiB Beeldmateriaal CC-BY 4.0
CIR CIR_33FN1.tiff 62.8 MiB CC-BY 4.0
2017 RGB RGB_33FN1.tiff 71.5 MiB Beeldmateriaal CC-BY 4.0
CIR CIR_33FN1.tiff 65.1 MiB CC-BY 4.0
2018 RGB RGB_33FN1.tiff 65.1 MiB Beeldmateriaal CC-BY 4.0
CIR CIR_33FN1.tiff 62.5 MiB CC-BY 4.0
2019 RGB RGB_33FN1.tiff 70.7 MiB Beeldmateriaal CC-BY 4.0
CIR CIR_33FN1.tiff 67.6 MiB CC-BY 4.0
2020 RGB RGB_33FN1.tiff 69.0 MiB Beeldmateriaal CC-BY 4.0
CIR CIR_33FN1.tiff 64.4 MiB CC-BY 4.0
2022 RGB RGB_33FN1.tiff 69.9 MiB Beeldmateriaal CC-BY 4.0
CIR CIR_33FN1.tiff 71.4 MiB CC-BY 4.0
2023 RGB RGB_33FN1.tiff 66.6 MiB Beeldmateriaal CC-BY 4.0
CIR CIR_33FN1.tiff 68.0 MiB CC-BY 4.0

Sub-tiles 33FN1

Image adapted from Kadaster TOPraster and OpenTopo.

Actueel Hoogtebestand Nederland

Point cloud

These sub-tiles of 1×1.25 km are clipped from the original point cloud. Goal is to enable distributed processing of the point cloud. Therefore, a 25 m overlap to the neighbouring (sub-)tiles is added. Thanks to the overlap between sub-tiles, the sub-tiles can be processed independently and therefore parallel.

All other data sets on this website are only available in the main tiling schema.

Tile Version Point cloud Spatial index Info Residential areas License
33FN1_01 AHN1 33FN1_01.LAZ 1.9 MiB 33FN1_01.LAX 4 kiB 33FN1_01.txt 13 kiB Deventer, Snippeling AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_01.LAZ 63.7 MiB 33FN1_01.LAX 32 kiB 33FN1_01.txt 16 kiB
AHN3 33FN1_01.LAZ 130.2 MiB 33FN1_01.LAX 87 kiB 33FN1_01.txt 17 kiB
AHN4 33FN1_01.LAZ 320.8 MiB 33FN1_01.LAX 99 kiB 33FN1_01.txt 18 kiB
33FN1_02 AHN1 33FN1_02.LAZ 2.0 MiB 33FN1_02.LAX 4 kiB 33FN1_02.txt 14 kiB Deventer, Colmschate AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_02.LAZ 66.1 MiB 33FN1_02.LAX 32 kiB 33FN1_02.txt 16 kiB
AHN3 33FN1_02.LAZ 134.8 MiB 33FN1_02.LAX 92 kiB 33FN1_02.txt 16 kiB
AHN4 33FN1_02.LAZ 328.8 MiB 33FN1_02.LAX 100 kiB 33FN1_02.txt 17 kiB
33FN1_03 AHN1 33FN1_03.LAZ 1.9 MiB 33FN1_03.LAX 5 kiB 33FN1_03.txt 13 kiB Deventer, Colmschate, De Bannink AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_03.LAZ 64.2 MiB 33FN1_03.LAX 32 kiB 33FN1_03.txt 15 kiB
AHN3 33FN1_03.LAZ 136.1 MiB 33FN1_03.LAX 92 kiB 33FN1_03.txt 16 kiB
AHN4 33FN1_03.LAZ 302.5 MiB 33FN1_03.LAX 100 kiB 33FN1_03.txt 17 kiB
33FN1_04 AHN1 33FN1_04.LAZ 2.2 MiB 33FN1_04.LAX 5 kiB 33FN1_04.txt 14 kiB De Bannink, Deventer AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_04.LAZ 66.3 MiB 33FN1_04.LAX 31 kiB 33FN1_04.txt 15 kiB
AHN3 33FN1_04.LAZ 149.5 MiB 33FN1_04.LAX 88 kiB 33FN1_04.txt 16 kiB
AHN4 33FN1_04.LAZ 275.5 MiB 33FN1_04.LAX 100 kiB 33FN1_04.txt 17 kiB
33FN1_05 AHN1 33FN1_05.LAZ 2.2 MiB 33FN1_05.LAX 5 kiB 33FN1_05.txt 14 kiB De Bannink AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_05.LAZ 65.3 MiB 33FN1_05.LAX 32 kiB 33FN1_05.txt 15 kiB
AHN3 33FN1_05.LAZ 143.7 MiB 33FN1_05.LAX 86 kiB 33FN1_05.txt 16 kiB
AHN4 33FN1_05.LAZ 273.9 MiB 33FN1_05.LAX 100 kiB 33FN1_05.txt 17 kiB
33FN1_06 AHN1 33FN1_06.LAZ 1.8 MiB 33FN1_06.LAX 4 kiB 33FN1_06.txt 14 kiB Deventer, Snippeling AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_06.LAZ 70.2 MiB 33FN1_06.LAX 39 kiB 33FN1_06.txt 18 kiB
AHN3 33FN1_06.LAZ 112.1 MiB 33FN1_06.LAX 84 kiB 33FN1_06.txt 19 kiB
AHN4 33FN1_06.LAZ 218.2 MiB 33FN1_06.LAX 99 kiB 33FN1_06.txt 19 kiB
33FN1_07 AHN1 33FN1_07.LAZ 1.9 MiB 33FN1_07.LAX 4 kiB 33FN1_07.txt 12 kiB Deventer, Colmschate AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_07.LAZ 64.7 MiB 33FN1_07.LAX 32 kiB 33FN1_07.txt 15 kiB
AHN3 33FN1_07.LAZ 130.2 MiB 33FN1_07.LAX 88 kiB 33FN1_07.txt 16 kiB
AHN4 33FN1_07.LAZ 245.1 MiB 33FN1_07.LAX 100 kiB 33FN1_07.txt 17 kiB
33FN1_08 AHN1 33FN1_08.LAZ 2.0 MiB 33FN1_08.LAX 4 kiB 33FN1_08.txt 12 kiB Deventer, Colmschate, De Bannink, Oxe AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_08.LAZ 66.4 MiB 33FN1_08.LAX 33 kiB 33FN1_08.txt 15 kiB
AHN3 33FN1_08.LAZ 147.6 MiB 33FN1_08.LAX 96 kiB 33FN1_08.txt 16 kiB
AHN4 33FN1_08.LAZ 246.4 MiB 33FN1_08.LAX 100 kiB 33FN1_08.txt 18 kiB
33FN1_09 AHN1 33FN1_09.LAZ 1.8 MiB 33FN1_09.LAX 5 kiB 33FN1_09.txt 13 kiB De Bannink, Oxe AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_09.LAZ 61.9 MiB 33FN1_09.LAX 46 kiB 33FN1_09.txt 14 kiB
AHN3 33FN1_09.LAZ 134.8 MiB 33FN1_09.LAX 93 kiB 33FN1_09.txt 16 kiB
AHN4 33FN1_09.LAZ 222.5 MiB 33FN1_09.LAX 100 kiB 33FN1_09.txt 17 kiB
33FN1_10 AHN1 33FN1_10.LAZ 1.6 MiB 33FN1_10.LAX 4 kiB 33FN1_10.txt 13 kiB Oxe, De Bannink, Dortherhoek AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_10.LAZ 50.8 MiB 33FN1_10.LAX 27 kiB 33FN1_10.txt 15 kiB
AHN3 33FN1_10.LAZ 109.9 MiB 33FN1_10.LAX 89 kiB 33FN1_10.txt 16 kiB
AHN4 33FN1_10.LAZ 201.4 MiB 33FN1_10.LAX 100 kiB 33FN1_10.txt 17 kiB
33FN1_11 AHN1 33FN1_11.LAZ 1.5 MiB 33FN1_11.LAX 4 kiB 33FN1_11.txt 13 kiB Deventer, Epse AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_11.LAZ 80.4 MiB 33FN1_11.LAX 41 kiB 33FN1_11.txt 15 kiB
AHN3 33FN1_11.LAZ 113.5 MiB 33FN1_11.LAX 90 kiB 33FN1_11.txt 25 kiB
AHN4 33FN1_11.LAZ 213.3 MiB 33FN1_11.LAX 98 kiB 33FN1_11.txt 32 kiB
33FN1_12 AHN1 33FN1_12.LAZ 1.5 MiB 33FN1_12.LAX 5 kiB 33FN1_12.txt 12 kiB Deventer AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_12.LAZ 67.4 MiB 33FN1_12.LAX 34 kiB 33FN1_12.txt 15 kiB
AHN3 33FN1_12.LAZ 139.9 MiB 33FN1_12.LAX 92 kiB 33FN1_12.txt 17 kiB
AHN4 33FN1_12.LAZ 257.3 MiB 33FN1_12.LAX 98 kiB 33FN1_12.txt 19 kiB
33FN1_13 AHN1 33FN1_13.LAZ 1.5 MiB 33FN1_13.LAX 5 kiB 33FN1_13.txt 13 kiB Oxe AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_13.LAZ 58.2 MiB 33FN1_13.LAX 29 kiB 33FN1_13.txt 15 kiB
AHN3 33FN1_13.LAZ 142.7 MiB 33FN1_13.LAX 93 kiB 33FN1_13.txt 16 kiB
AHN4 33FN1_13.LAZ 243.3 MiB 33FN1_13.LAX 100 kiB 33FN1_13.txt 17 kiB
33FN1_14 AHN1 33FN1_14.LAZ 1.6 MiB 33FN1_14.LAX 5 kiB 33FN1_14.txt 11 kiB Oxe AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_14.LAZ 46.6 MiB 33FN1_14.LAX 24 kiB 33FN1_14.txt 15 kiB
AHN3 33FN1_14.LAZ 103.2 MiB 33FN1_14.LAX 86 kiB 33FN1_14.txt 14 kiB
AHN4 33FN1_14.LAZ 187.6 MiB 33FN1_14.LAX 100 kiB 33FN1_14.txt 15 kiB
33FN1_15 AHN1 33FN1_15.LAZ 1.5 MiB 33FN1_15.LAX 4 kiB 33FN1_15.txt 9 kiB Oxe, Dortherhoek, Kring van Dorth AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_15.LAZ 39.0 MiB 33FN1_15.LAX 23 kiB 33FN1_15.txt 12 kiB
AHN3 33FN1_15.LAZ 83.5 MiB 33FN1_15.LAX 78 kiB 33FN1_15.txt 13 kiB
AHN4 33FN1_15.LAZ 160.6 MiB 33FN1_15.LAX 100 kiB 33FN1_15.txt 14 kiB
33FN1_16 AHN1 33FN1_16.LAZ 1.5 MiB 33FN1_16.LAX 4 kiB 33FN1_16.txt 13 kiB Epse AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_16.LAZ 93.7 MiB 33FN1_16.LAX 46 kiB 33FN1_16.txt 16 kiB
AHN3 33FN1_16.LAZ 148.7 MiB 33FN1_16.LAX 95 kiB 33FN1_16.txt 17 kiB
AHN4 33FN1_16.LAZ 257.5 MiB 33FN1_16.LAX 100 kiB 33FN1_16.txt 18 kiB
33FN1_17 AHN1 33FN1_17.LAZ 1.6 MiB 33FN1_17.LAX 5 kiB 33FN1_17.txt 13 kiB AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_17.LAZ 130.0 MiB 33FN1_17.LAX 61 kiB 33FN1_17.txt 15 kiB
AHN3 33FN1_17.LAZ 253.6 MiB 33FN1_17.LAX 99 kiB 33FN1_17.txt 17 kiB
AHN4 33FN1_17.LAZ 399.8 MiB 33FN1_17.LAX 100 kiB 33FN1_17.txt 18 kiB
33FN1_18 AHN1 33FN1_18.LAZ 1.5 MiB 33FN1_18.LAX 5 kiB 33FN1_18.txt 12 kiB AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_18.LAZ 81.4 MiB 33FN1_18.LAX 39 kiB 33FN1_18.txt 14 kiB
AHN3 33FN1_18.LAZ 199.8 MiB 33FN1_18.LAX 95 kiB 33FN1_18.txt 16 kiB
AHN4 33FN1_18.LAZ 319.2 MiB 33FN1_18.LAX 100 kiB 33FN1_18.txt 17 kiB
33FN1_19 AHN1 33FN1_19.LAZ 1.4 MiB 33FN1_19.LAX 5 kiB 33FN1_19.txt 11 kiB AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_19.LAZ 53.7 MiB 33FN1_19.LAX 28 kiB 33FN1_19.txt 14 kiB
AHN3 33FN1_19.LAZ 124.8 MiB 33FN1_19.LAX 89 kiB 33FN1_19.txt 16 kiB
AHN4 33FN1_19.LAZ 220.8 MiB 33FN1_19.LAX 100 kiB 33FN1_19.txt 17 kiB
33FN1_20 AHN1 33FN1_20.LAZ 1.5 MiB 33FN1_20.LAX 4 kiB 33FN1_20.txt 11 kiB Kring van Dorth AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_20.LAZ 51.7 MiB 33FN1_20.LAX 28 kiB 33FN1_20.txt 14 kiB
AHN3 33FN1_20.LAZ 109.0 MiB 33FN1_20.LAX 85 kiB 33FN1_20.txt 14 kiB
AHN4 33FN1_20.LAZ 195.6 MiB 33FN1_20.LAX 99 kiB 33FN1_20.txt 15 kiB
33FN1_21 AHN1 33FN1_21.LAZ 1.4 MiB 33FN1_21.LAX 4 kiB 33FN1_21.txt 12 kiB Gorssel AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_21.LAZ 100.6 MiB 33FN1_21.LAX 44 kiB 33FN1_21.txt 14 kiB
AHN3 33FN1_21.LAZ 153.8 MiB 33FN1_21.LAX 96 kiB 33FN1_21.txt 15 kiB
AHN4 33FN1_21.LAZ 246.8 MiB 33FN1_21.LAX 99 kiB 33FN1_21.txt 16 kiB
33FN1_22 AHN1 33FN1_22.LAZ 1.4 MiB 33FN1_22.LAX 4 kiB 33FN1_22.txt 13 kiB Gorssel, 't Amelte AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_22.LAZ 109.1 MiB 33FN1_22.LAX 51 kiB 33FN1_22.txt 15 kiB
AHN3 33FN1_22.LAZ 200.2 MiB 33FN1_22.LAX 96 kiB 33FN1_22.txt 17 kiB
AHN4 33FN1_22.LAZ 325.6 MiB 33FN1_22.LAX 100 kiB 33FN1_22.txt 18 kiB
33FN1_23 AHN1 33FN1_23.LAZ 1.5 MiB 33FN1_23.LAX 5 kiB 33FN1_23.txt 13 kiB Joppe AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_23.LAZ 146.8 MiB 33FN1_23.LAX 52 kiB 33FN1_23.txt 16 kiB
AHN3 33FN1_23.LAZ 236.9 MiB 33FN1_23.LAX 98 kiB 33FN1_23.txt 17 kiB
AHN4 33FN1_23.LAZ 395.5 MiB 33FN1_23.LAX 100 kiB 33FN1_23.txt 18 kiB
33FN1_24 AHN1 33FN1_24.LAZ 1.4 MiB 33FN1_24.LAX 5 kiB 33FN1_24.txt 13 kiB AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_24.LAZ 99.0 MiB 33FN1_24.LAX 46 kiB 33FN1_24.txt 15 kiB
AHN3 33FN1_24.LAZ 198.5 MiB 33FN1_24.LAX 90 kiB 33FN1_24.txt 17 kiB
AHN4 33FN1_24.LAZ 315.0 MiB 33FN1_24.LAX 100 kiB 33FN1_24.txt 18 kiB
33FN1_25 AHN1 33FN1_25.LAZ 1.4 MiB 33FN1_25.LAX 4 kiB 33FN1_25.txt 12 kiB AHN (stuurgroep AHN, public data) and aerial photograph (Beeldmateriaal, CC-BY) remixed by GeoTiles, CC-BY
AHN2 33FN1_25.LAZ 72.8 MiB 33FN1_25.LAX 37 kiB 33FN1_25.txt 14 kiB
AHN3 33FN1_25.LAZ 135.2 MiB 33FN1_25.LAX 89 kiB 33FN1_25.txt 16 kiB
AHN4 33FN1_25.LAZ 235.1 MiB 33FN1_25.LAX 100 kiB 33FN1_25.txt 17 kiB

No guarantee on availability, completeness, correctness or fitness for any particular purpose is implied by the distribution of or linking to this data. The license indicated with the products is to the best of my knowledge at the time of writing. Please confirm the applicable license with the source before integrating the data.