정사영상은 지형 기복, 노출 순간의 지면 대비 카메라 기울기, 카메라 중앙 투영으로 인해 발생하는 왜곡이 제거된 처리된 항공 사진입니다. 디지털 직교사진에는 특정 픽셀 크기 또는 해상도가 있으며, 이는 지상에서 나눌 수 없는 가장 작은 노출 영역 (지상 샘플링 거리, GSD)을 보여줍니다.
오르토포토는 전국을 대상으로 하며 1:5000~1:10000의 축척에 해당합니다 (픽셀 크기 20~40cm). 인구 밀도가 높은 지역의 직교사진은 10~16cm의 픽셀 크기로 생성됩니다.
mono_low_flying 데이터 세트에는 인구 밀도가 높은 지역의 단일 그레이 스케일 밴드가 있습니다.
[null,null,[],[[["\u003cp\u003eThe "Estonia/Maamet/orthos/mono_low_flying" dataset provides orthophotos covering Estonia from 1993 to 2021.\u003c/p\u003e\n"],["\u003cp\u003eOrthophotos are aerial photos geometrically corrected to remove distortions caused by terrain and camera angle.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset focuses on densely populated areas with a resolution of 0.4 meters and a single grayscale band.\u003c/p\u003e\n"],["\u003cp\u003eThe data is free for commercial and non-commercial use with proper attribution to the Estonian Land Board.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset is easily accessible and analyzable through the Google Earth Engine platform.\u003c/p\u003e\n"]]],[],null,["# Estonia mono low flying orthophotos\n\nDataset Availability\n: 1993-01-01T00:00:00Z--2021-06-16T00:00:00Z\n\nDataset Provider\n:\n\n\n [Estonia orthophotos](https://geoportaal.maaamet.ee/eng/Spatial-Data/Orthophotos-p309.html)\n\nTags\n:\n[estonia](/earth-engine/datasets/tags/estonia) [low-flying](/earth-engine/datasets/tags/low-flying) [orthophotos](/earth-engine/datasets/tags/orthophotos) \n\n#### Description\n\nOrthophotos are an aerial photo dataset covering Estonia.\n\nAn orthophoto is a processed aerial photo from which distortions caused\nby terrain relief, camera tilt relative to the ground at the moment of\nexposure and camera central projection are removed. A digital orthophoto\nhas a certain pixel size or resolution which shows the smallest\nindivisible exposed area on the ground (Ground Sampling Distance, GSD).\n\nOrthophotos have a nationwide coverage and correspond to the scale of\n1:5000-1:10000 (pixel size 20-40 cm). Orthophotos for densely-populated\nareas are produced with the pixel size of 10-16 cm.\n\nThe mono_low_flying dataset has a single grayscale band for\ndensely-populated areas.\n\nFor more information, please see the\n[Estonia orthophotos documentation](https://geoportaal.maaamet.ee/eng/Spatial-Data/Orthophotos-p309.html)\n\n### Bands\n\n\n**Pixel Size**\n\n0.4 meters\n\n**Bands**\n\n| Name | Min | Max | Pixel Size | Description |\n|--------|-----|-----|------------|-------------|\n| `mono` | 0 | 255 | meters | Grayscale |\n\n### Terms of Use\n\n**Terms of Use**\n\nThe data is free to use for commercial and non-commercial purposes for a\nnon-specified term, provided that proper attribution is given to the\nlicensor (e.g. Estonian Land Board) along with the title and age of the\ndata.\n\nFor more details please see the\n[Terms of use](https://geoportaal.maaamet.ee/docs/Avaandmed/Licence-of-open-data-of-Estonian-Land-Board.pdf)\n\n### Citations\n\nCitations:\n\n- Map data: Estonian Land Board\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.ImageCollection('Estonia/Maamet/orthos/mono_low_flying');\nMap.setCenter(24.959, 58.148, 18);\nMap.addLayer(dataset, null, 'Estonia Maamet mono low flying');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/Estonia/Estonia_Maamet_orthos_mono_low_flying) \n[Estonia mono low flying orthophotos](/earth-engine/datasets/catalog/Estonia_Maamet_orthos_mono_low_flying) \nOrthophotos are an aerial photo dataset covering Estonia. An orthophoto is a processed aerial photo from which distortions caused by terrain relief, camera tilt relative to the ground at the moment of exposure and camera central projection are removed. A digital orthophoto has a certain pixel size or resolution which ... \nEstonia/Maamet/orthos/mono_low_flying, estonia,low-flying,orthophotos \n1993-01-01T00:00:00Z/2021-06-16T00:00:00Z \n57.3 21.5 59.5 28.1 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://geoportaal.maaamet.ee/eng/Spatial-Data/Orthophotos-p309.html)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/Estonia_Maamet_orthos_mono_low_flying)"]]
