Mosaik Gambar Landsat Antartika (LIMA) adalah mosaik yang mulus
dan hampir tanpa awan yang dibuat dari pemrosesan
adegan Landsat 7 ETM+.
Adegan Landsat yang Diproses (16 bit) adalah adegan NLAPS Level 1Gt yang dikonversi menjadi 16 bit, diproses dengan koreksi sudut matahari, dan dikonversi menjadi nilai reflektansi (Bindschadler 2008).
Setiap gambar Landsat diproses dengan data elevasi dan koreksi sudut matahari untuk memastikan fitur permukaan ditampilkan secara akurat. Sudut matahari di Antartika memberikan kesan matahari terbenam. Karena sudut matahari yang rendah, saat Landsat melintasi Antartika, tepi luar benua tampak lebih terang daripada area yang lebih dekat ke Kutub Selatan, sehingga pemandangan memiliki area terang dan gelap.
Sudut matahari dan bayangan yang tidak konsisten diperbaiki untuk adegan ini. Tanpa proses ini, mosaik akan menghasilkan
gabungan adegan karena setiap adegan akan memiliki sisi yang lebih terang
dan sisi yang lebih gelap.
Ini adalah tabel yang berisi metadata untuk Kumpulan Gambar
USGS/LIMA/SR
Skema Tabel
Skema Tabel
Nama
Jenis
Deskripsi
ACQ_DATE
STRING
Tanggal akuisisi dalam format YYYY-MM-DD
JALUR
INT
Jalur WRS
POLY_ID
INT
ID unik yang ditetapkan ke poligon
ROW
INT
Baris WRS
SCENE_ID
STRING
ID Adegan
SENSOR
STRING
Sensor
SPACE
STRING
Nama satelit yang digunakan untuk mengumpulkan data
Persyaratan Penggunaan
Persyaratan Penggunaan
Gambar-gambar ini berada dalam domain publik dan dapat digunakan secara bebas
dan tanpa atribusi. Namun, kami sangat mengapresiasi jika Anda memberikan atribusi kepada Project Landsat Image Mosaic of Antarctica (LIMA).
Kutipan
Kutipan:
Bindschadler, R., Vornberger, P., Fleming, A., Fox, A., Mullins, J.,
Binnie, D., Paulson, S., Granneman, B., dan Gorodetzky, D., 2008,
The Landsat Image Mosaic of Antarctica, Remote Sensing of
Environment, 112, hlm. 4214-4226.
PDF
Mosaik Gambar Landsat Antartika (LIMA) adalah mosaik yang mulus dan hampir bebas awan yang dibuat dari pemrosesan scene Landsat 7 ETM+. Adegan Landsat yang Diproses (16 bit) adalah adegan NLAPS Level 1Gt yang dikonversi menjadi 16 bit, diproses dengan koreksi sudut matahari, dan dikonversi menjadi nilai reflektansi (Bindschadler 2008). Setiap gambar Landsat adalah …
[null,null,[],[[["\u003cp\u003eUSGS LIMA is a cloud-free Landsat 7 ETM+ mosaic of Antarctica, created from scenes processed to reflectance values with sun-angle correction.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset provides a table containing metadata for the USGS/LIMA/SR Image Collection, including acquisition date, sensor, and scene ID.\u003c/p\u003e\n"],["\u003cp\u003eLIMA data covers the period from June 30, 1999, to September 4, 2002, and is freely available for use without acknowledgment.\u003c/p\u003e\n"],["\u003cp\u003eEach Landsat scene in the mosaic was individually processed using elevation data and sun-angle correction to ensure accurate representation of surface features.\u003c/p\u003e\n"],["\u003cp\u003eThe metadata table schema includes fields such as acquisition date, WRS path/row, polygon ID, scene ID, sensor, and satellite name.\u003c/p\u003e\n"]]],["The Landsat Image Mosaic of Antarctica (LIMA), provided by USGS, is a cloudless mosaic from processed Landsat 7 ETM+ scenes. Data, available from 1999-06-30 to 2002-09-04, are level 1Gt NLAPS scenes converted to 16-bit reflectance values with sun-angle correction. Metadata for the collection can be accessed via `ee.FeatureCollection(\"USGS/LIMA/SR_METADATA\")` in Earth Engine, providing acquisition date, path, row, scene ID, sensor, and satellite information. These images are public domain.\n"],null,["# Landsat Image Mosaic of Antarctica (LIMA) - Processed Landsat Scenes (16 bit) Metadata\n\nDataset Availability\n: 1999-06-30T00:00:00Z--2002-09-04T00:00:00Z\n\nDataset Provider\n:\n\n\n [USGS](https://lima.usgs.gov/index.php)\n\nTags\n:\n[antarctica](/earth-engine/datasets/tags/antarctica) [ice](/earth-engine/datasets/tags/ice) [landsat-derived](/earth-engine/datasets/tags/landsat-derived) [lima](/earth-engine/datasets/tags/lima) [mosaic](/earth-engine/datasets/tags/mosaic) [satellite-imagery](/earth-engine/datasets/tags/satellite-imagery) [sr](/earth-engine/datasets/tags/sr) [table](/earth-engine/datasets/tags/table) [usgs](/earth-engine/datasets/tags/usgs) \n\n#### Description\n\nThe Landsat Image Mosaic of Antarctica (LIMA) is a seamless\nand virtually cloudless mosaic created from processed\nLandsat 7 ETM+ scenes.\n\nProcessed Landsat Scenes (16 bit) are Level 1Gt NLAPS\nscenes converted to 16 bit, processed with sun-angle\ncorrection, and converted to reflectance values\n([Bindschadler 2008](https://lima.usgs.gov/LIMA_paper.pdf)).\n\nEach Landsat scene is processed with elevation\ndata and sun-angle correction to ensure surface features\nwere accurately represented. The sun's angle in Antarctica\ngives the appearance of a setting sun. Because of the low\nsun angle, as Landsat passes over Antarctica, the outer\nedges of the continent appear brighter than areas closer\nto the South Pole, so scenes have bright and dark areas.\nInconsistent sun angles and shadows where corrected for\nthese scenes. Without this process, mosaicking would produce\na patchwork of scenes since each scene would have a brighter\nand a darker side.\n\nThis is a table which contains metadata for the Image Collection\n[USGS/LIMA/SR](/earth-engine/datasets/catalog/USGS_LIMA_SR)\n\n### Table Schema\n\n**Table Schema**\n\n| Name | Type | Description |\n|----------|--------|-------------------------------------------|\n| ACQ_DATE | STRING | Acquisition date in YYYY-MM-DD format |\n| PATH | INT | WRS path |\n| POLY_ID | INT | Unique ID assigned to a polygon |\n| ROW | INT | WRS row |\n| SCENE_ID | STRING | Scene ID |\n| SENSOR | STRING | Sensor |\n| SPACE | STRING | Name of the satellite used to gather data |\n\n### Terms of Use\n\n**Terms of Use**\n\nThese images are in the public domain and can be used freely\nand without acknowledgement. However, credit to the Landsat\nImage Mosaic of Antarctica (LIMA) Project is greatly appreciated.\n\n### Citations\n\nCitations:\n\n- Bindschadler, R., Vornberger, P., Fleming, A., Fox, A., Mullins, J.,\n Binnie, D., Paulson, S., Granneman, B., and Gorodetzky, D., 2008,\n The Landsat Image Mosaic of Antarctica, Remote Sensing of\n Environment, 112, pp. 4214-4226.\n [PDF](https://lima.usgs.gov/LIMA_paper.pdf)\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 dataset = ee.FeatureCollection('USGS/LIMA/SR_METADATA');\n\n// Calculate the age of each feature by subtracting\n// the acquisition date from \"today\".\nvar feature_ages = dataset.map(\n function(feature) {\n var today = ee.Date.fromYMD(2024, 1, 12);\n var acq_date = ee.Date.parse(\n 'yyyy-MM-dd', feature.get('ACQ_DATE'));\n var diff = today.difference(acq_date, 'day');\n return feature.set({'ACQ_AGE': diff});\n }\n);\n\n// Reduce by calculating the smallest ACQ_AGE,\n// which gives the most recent acquisition date for\n// that area.\nvar reduced_ages = feature_ages.reduceToImage({\n properties: ['ACQ_AGE'],\n reducer: ee.Reducer.min()\n});\n\nvar reduced_ages_vis = {\n min: 6000,\n max: 9000,\n palette: ['00ff00', 'ff0000'],\n};\n\nvar lon = -43.6;\nvar lat = -74.2;\nvar gray = 150;\nvar background = ee.Image.rgb(gray, gray, gray).visualize({min: 0, max: 255});\n\nMap.setCenter(lon, lat, 2);\nMap.addLayer(\n reduced_ages,\n reduced_ages_vis,\n 'Acquisition Age');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/USGS/USGS_LIMA_SR_METADATA) \n[Landsat Image Mosaic of Antarctica (LIMA) - Processed Landsat Scenes (16 bit) Metadata](/earth-engine/datasets/catalog/USGS_LIMA_SR_METADATA) \nThe Landsat Image Mosaic of Antarctica (LIMA) is a seamless and virtually cloudless mosaic created from processed Landsat 7 ETM+ scenes. Processed Landsat Scenes (16 bit) are Level 1Gt NLAPS scenes converted to 16 bit, processed with sun-angle correction, and converted to reflectance values (Bindschadler 2008). Each Landsat scene is ... \nUSGS/LIMA/SR_METADATA, antarctica,ice,landsat-derived,lima,mosaic,satellite-imagery,sr,table,usgs \n1999-06-30T00:00:00Z/2002-09-04T00:00:00Z \n-90 -180 -55 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://lima.usgs.gov/index.php)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/USGS_LIMA_SR_METADATA)"]]
