<HTML><BODY><p class="MsoNormal"><span style="font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-ansi-language: EN-US;" lang="EN-US" data-mce-style="font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-ansi-language: EN-US;">Hello.</span></p><p class="MsoNormal"><span style="font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-ansi-language: EN-US;" lang="EN-US" data-mce-style="font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-ansi-language: EN-US;">During a current research and development on the topic processing of remote sensing data (on the scale of the city and for the purpose of urban planning and projection), my team and I faced with a list of problems, some questions, that are eager to find answers.</span></p><ol style="margin-top: 0cm;" type="1" start="1" data-mce-style="margin-top: 0cm;"><li class="MsoNormalCxSpMiddle" style="margin-left: 17.45pt; mso-add-space: auto; text-align: justify; line-height: 150%; mso-list: l0 level1 lfo1;" data-mce-style="margin-left: 17.45pt; mso-add-space: auto; text-align: justify; line-height: 150%; mso-list: l0 level1 lfo1;"><span style="font-size: 12.0pt; line-height: 150%; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US;" lang="EN-US" data-mce-style="font-size: 12.0pt; line-height: 150%; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US;">Sentinel-2 Data is downloaded in jpeg 2000 format, which is compressed format and at preservation in this format there is the loss of the images quality. Initially, Sentinel-1, 2, 3 Data should be free and accessible. But in fact, we could hardly download the products in the format jpeg2000. But it is impossible to process this images – the quality is horrible (we need more than 10 m/pxl).</span></li><li class="MsoNormalCxSpLast" style="margin-left: 17.45pt; mso-add-space: auto; text-align: justify; line-height: 150%; mso-list: l0 level1 lfo1;" data-mce-style="margin-left: 17.45pt; mso-add-space: auto; text-align: justify; line-height: 150%; mso-list: l0 level1 lfo1;"><span style="font-size: 12.0pt; line-height: 150%; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US;" lang="EN-US" data-mce-style="font-size: 12.0pt; line-height: 150%; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US;">Found significant difficulties with the selection of Sentinel images. Sentinel is a research project, so the satellites fly and automatically capture images the whole territory. Among the array of historical data are very few appropriate images. For each pilot cities, we managed to pick up only per 1 image for 2016. The rest are either in the wrong season or have a high cloudiness (95% of the image). </span></li></ol><p class="MsoListParagraph" style="margin-left: 53.45pt; mso-add-space: auto; text-indent: 0cm;" data-mce-style="margin-left: 53.45pt; mso-add-space: auto; text-indent: 0cm;"><span lang="EN-US">Found images do not cover the whole territory of one frame of the city, and the selection of the missing gaps is not possible due to the above indicated problems. It is understandable, how to conduct regular monitoring in these conditions. This leads to the idea that it is necessary to order satellite imagery. Do you know, whom to contact about Sentinels and whether it is possible to get from them the special, under the order images?</span></p><ol style="margin-top: 0cm;" type="1" start="3" data-mce-style="margin-top: 0cm;"><li class="MsoNormalCxSpFirst" style="margin-left: 17.45pt; mso-add-space: auto; text-align: justify; line-height: 150%; mso-list: l0 level1 lfo1;" data-mce-style="margin-left: 17.45pt; mso-add-space: auto; text-align: justify; line-height: 150%; mso-list: l0 level1 lfo1;"><span style="font-size: 12.0pt; line-height: 150%; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US;" lang="EN-US" data-mce-style="font-size: 12.0pt; line-height: 150%; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US;">The best resolution of Sentinel-2 data in four channels is 10 meters. This is the upper limit of the spatial resolution that can be used for monitoring of urban areas. And even only for undeveloped urban areas and inter-settlement territories. On the territory of a thick building the image turns into mess, and to obtain useful results it should be used paid high resolution images. Where (if it is possible) can we download these satellite’s (Sentinel) images, I mean from open resources?</span></li><li class="MsoNormalCxSpMiddle" style="margin-left: 17.45pt; mso-add-space: auto; text-align: justify; line-height: 150%; mso-list: l0 level1 lfo1;" data-mce-style="margin-left: 17.45pt; mso-add-space: auto; text-align: justify; line-height: 150%; mso-list: l0 level1 lfo1;"><span style="font-size: 12.0pt; line-height: 150%; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US;" lang="EN-US" data-mce-style="font-size: 12.0pt; line-height: 150%; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US;">There is a big problem with data processing in free open source software (SNAP, GRASS GIS, etc.). There is no any documentation and understandable skills of <u>Sentinel</u> using, that is why all actions, making in these software, are delayed for a long time and often do not lead to the expected result. </span></li></ol><p class="MsoNormal"><span style="font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-ansi-language: EN-US;" lang="EN-US" data-mce-style="font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-ansi-language: EN-US;">Thank you in advance.</span></p><br><br>__<br>С уважением,<br>Иванова Ю.А.</BODY></HTML>