DTM/DSM Komposit LIDAR adalah model medan raster yang mencakup ~99% wilayah Inggris Raya dengan resolusi spasial 1 m, yang diproduksi oleh UK Environment Agency pada tahun 2022. Model ini berisi 3 band data medan: Model Medan Digital (DTM), Model Permukaan Digital (DSM) pengembalian pertama, dan DSM pengembalian terakhir.
DTM dihasilkan dari pulsa laser terakhir atau satu-satunya yang dikembalikan ke sensor. Objek permukaan dihapus dari DSM, menggunakan algoritma khusus dan pengeditan data secara manual, untuk menghasilkan model medan hanya permukaan. DTM berasal dari kombinasi arsip EA Time Stamped dan survei National LIDAR Program, yang telah digabungkan dan di-sampling ulang untuk memberikan cakupan terbaik. Jika survei berulang telah dilakukan, data resolusi terbaik dan terbaru akan digunakan. Jika data di-resample, interpolasi bilinear digunakan sebelum digabungkan. Komposit LIDAR 2022 berisi survei yang dilakukan antara 6 Juni 2000 dan 2 April 2022.
DSM pengembalian pertama dihasilkan dari pulsa laser pertama atau satu-satunya yang dikembalikan
ke sensor dan mencakup ketinggian objek, seperti kendaraan, bangunan
dan vegetasi, serta permukaan medan tempat pengembalian pertama atau satu-satunya
adalah tanah. DSM pengembalian pertama berasal dari data yang diambil sebagai
bagian dari Program LIDAR Nasional antara 11 November 2016 dan 5 Mei
2022. Program ini membagi Inggris menjadi ~300 blok untuk survei selama musim dingin berkelanjutan dari tahun 2016 dan seterusnya. Survei ini digabungkan untuk membuat komposit LIDAR pengembalian pertama menggunakan teknik feathering di sepanjang tumpang-tindih untuk menghilangkan perbedaan kecil dalam elevasi antara survei.
Lihat katalog indeks metadata penyedia data yang menunjukkan survei mana yang digunakan dalam produksi komposit LIDAR untuk lokasi mana pun.
DSM pengembalian pertama tidak akan cocok dalam cakupan atau luasnya DSM pengembalian terakhir, karena komposit DSM pengembalian terakhir dihasilkan dari survei Timeseries dan Program LIDAR Nasional.
DSM pengembalian terakhir dihasilkan dari pulsa laser terakhir atau satu-satunya pulsa laser yang dikembalikan ke sensor dan mencakup ketinggian objek, seperti kendaraan, bangunan, dan vegetasi, serta permukaan medan. DTM terakhir yang ditampilkan berasal dari kombinasi arsip EA Time Stamped dan survei National LIDAR Program, yang telah digabungkan dan di-sampling ulang untuk memberikan cakupan terbaik. Jika survei berulang telah dilakukan, data resolusi terbaik dan terbaru akan digunakan. Jika data di-sampling ulang, interpolasi bilinear digunakan sebelum digabungkan. Komposit LIDAR 2022
berisi survei yang dilakukan antara 6 Juni 2000 dan 2 April 2022. Lihat katalog indeks metadata penyedia data yang menunjukkan survei mana yang digunakan dalam produksi komposit LIDAR untuk lokasi tertentu.
Data diselaraskan dengan petak Nasional OS dan ditampilkan dalam meter,
direferensikan ke Ordinance Survey Newlyn dan menggunakan metode transformasi OSTN'15. Semua survei LIDAR individual yang digunakan dalam produksi komposit memiliki akurasi vertikal dengan kesalahan root mean square +/-15 cm.
Band
Ukuran Piksel 1 meter
Band
Nama
Unit
Ukuran Piksel
Deskripsi
dtm
m
meter
Model Medan Digital
dsm_first
m
meter
Model Permukaan Digital Pengembalian Pertama
dsm_last
m
meter
Model Permukaan Digital Pengembalian Terakhir
Persyaratan Penggunaan
Persyaratan Penggunaan
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Anda harus mencantumkan sumber Informasi dalam produk atau aplikasi Anda dengan menyertakan atau menautkan ke pernyataan atribusi yang ditentukan oleh Penyedia Informasi dan, jika memungkinkan, memberikan link ke lisensi.
Pernyataan atribusi: Hak cipta dan/atau hak database Environment Agency 2022. Semua hak dilindungi undang-undang.
LIDAR Composite DTM/DSM adalah model medan raster yang mencakup ~99% wilayah Inggris dengan resolusi spasial 1 m, yang dibuat oleh UK Environment Agency pada tahun 2022. Model ini berisi 3 band data medan: Model Medan Digital (DTM), Model Permukaan Digital (DSM) pengembalian pertama, dan DSM pengembalian terakhir. …
[null,null,[],[[["\u003cp\u003eThe UK Environment Agency's LIDAR Composite DTM/DSM provides 1-meter resolution terrain data for ~99% of England.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset includes a Digital Terrain Model (DTM), and first and last return Digital Surface Models (DSMs).\u003c/p\u003e\n"],["\u003cp\u003eData originates from surveys between June 6, 2000 and April 2, 2022, with newer, higher-resolution data prioritized.\u003c/p\u003e\n"],["\u003cp\u003eIt's freely available for use with attribution under the Open Government Licence.\u003c/p\u003e\n"],["\u003cp\u003eEarth Engine users can access and analyze the dataset via the \u003ccode\u003eee.Image("UK/EA/ENGLAND_1M_TERRAIN/2022")\u003c/code\u003e snippet.\u003c/p\u003e\n"]]],[],null,["# England 1m Composite DTM/DSM (Environment Agency)\n\nDataset Availability\n: 2000-06-06T00:00:00Z--2022-04-02T00:00:00Z\n\nDataset Provider\n:\n\n\n [UK Environment Agency](https://www.data.gov.uk/dataset/f0db0249-f17b-4036-9e65-309148c97ce4/national-lidar-programme)\n\nTags\n:\n[dem](/earth-engine/datasets/tags/dem) [elevation](/earth-engine/datasets/tags/elevation) [elevation-topography](/earth-engine/datasets/tags/elevation-topography) [lidar](/earth-engine/datasets/tags/lidar) \n\n#### Description\n\nThe LIDAR Composite DTM/DSM is a raster terrain model covering \\~99% of\nEngland at 1m spatial resolution, produced by the UK Environment Agency in\n2022. The model contains 3 bands of terrain data: a Digital Terrain Model\n(DTM), a first return Digital Surface Model (DSM), and a last return DSM.\n\nThe DTM is produced from the last or only laser pulse returned to the\nsensor. Surface objects are removed from the DSM, using bespoke algorithms\nand manual editing of the data, to produce a terrain model of just the\nsurface. The DTM is derived from a combination of EA Time Stamped archive\nand National LIDAR Program surveys, which have been merged and re-sampled\nto give the best possible coverage. Where repeat surveys have been\nundertaken the newest, best resolution data is used. Where data was\nresampled a bilinear interpolation was used before being merged. The 2022\nLIDAR Composite contains surveys undertaken between 6th June 2000 and 2nd\nApril 2022.\n\nThe first return DSM is produced from the first or only laser pulse returned\nto the sensor and includes heights of objects, such as vehicles, buildings\nand vegetation, as well as the terrain surface where the first or only\nreturn was the ground. The first return DSM is derived from data captured as\npart of the National LIDAR Program between 11 November 2016 and 5th May\n2022. This program divided England into \\~300 blocks for survey over\ncontinuous winters from 2016 onwards. These surveys are merged together to\ncreate the first return LIDAR composite using a feathering technique along\nthe overlaps to remove any small differences in elevation between surveys.\nPlease refer to the data provider's metadata index catalogs which show for\nany location which survey was used in the production of the LIDAR composite.\nThe first return DSM will not match in coverage or extent of the last return\nDSM, as the last return DSM composite is produced from both the National\nLIDAR Program and Timeseries surveys.\n\nThe last return DSM is produced from the last or only laser pulse returned\nto the sensor and includes heights of objects, such as vehicles, buildings\nand vegetation, as well as the terrain surface. The last return DTM is\nderived from a combination of EA Time Stamped archive and National LIDAR\nProgram surveys, which have been merged and re-sampled to give the best\npossible coverage. Where repeat surveys have been undertaken the newest,\nbest resolution data is used. Where data was resampled a bilinear\ninterpolation was used before being merged. The 2022 LIDAR Composite\ncontains surveys undertaken between 6th June 2000 and 2nd April 2022. Please\nrefer to the data provider's metadata index catalogs which show for any\nlocation which survey was used in the production of the LIDAR composite.\n\nThe data is aligned to the OS National grid and presented in metres,\nreferenced to Ordinance Survey Newlyn and using the OSTN'15 transformation\nmethod. All individual LIDAR surveys going into the production of the\ncomposites had a vertical accuracy of +/-15cm root-mean-square error.\n\n### Bands\n\n\n**Pixel Size**\n\n1 meter\n\n**Bands**\n\n| Name | Units | Pixel Size | Description |\n|-------------|-------|------------|------------------------------------|\n| `dtm` | m | meters | Digital Terrain Model |\n| `dsm_first` | m | meters | First Return Digital Surface Model |\n| `dsm_last` | m | meters | Last Return Digital Surface Model |\n\n### Terms of Use\n\n**Terms of Use**\n\nYou are free to: copy, publish, distribute and transmit the Information;\nadapt the Information; exploit the Information commercially and\nnon-commercially for example, by combining it with other Information, or\nby including it in your own product or application.\n\nYou must acknowledge the source of the Information in your product or\napplication by including or linking to any attribution statement specified\nby the Information Provider(s) and, where possible, provide a link to the\n[license](https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).\nAttribution statement: Environment Agency copyright and/or database right\n2022. All rights reserved.\n\n### Explore with Earth Engine\n\n| **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)\n\n### Code Editor (JavaScript)\n\n```javascript\nvar img = ee.Image('UK/EA/ENGLAND_1M_TERRAIN/2022').select('dtm');\nvar visParam = {\n palette: ['0000ff', '00ffff', 'ffff00', 'ff0000', 'ffffff'],\n max: 630,\n min: -5,\n};\n\nvar lon = -2.5;\nvar lat = 54;\n\nMap.addLayer(img, visParam, 'dtm');\nMap.setCenter(lon, lat, 5);\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/UK/UK_EA_ENGLAND_1M_TERRAIN_2022) \n[England 1m Composite DTM/DSM (Environment Agency)](/earth-engine/datasets/catalog/UK_EA_ENGLAND_1M_TERRAIN_2022) \nThe LIDAR Composite DTM/DSM is a raster terrain model covering \\~99% of England at 1m spatial resolution, produced by the UK Environment Agency in 2022. The model contains 3 bands of terrain data: a Digital Terrain Model (DTM), a first return Digital Surface Model (DSM), and a last return DSM. ... \nUK/EA/ENGLAND_1M_TERRAIN/2022, dem,elevation,elevation-topography,lidar \n2000-06-06T00:00:00Z/2022-04-02T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://www.data.gov.uk/dataset/f0db0249-f17b-4036-9e65-309148c97ce4/national-lidar-programme)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/UK_EA_ENGLAND_1M_TERRAIN_2022)"]]
