Spectral ranges recorded: R, G, B, PAN and Infrared.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\nAs a result, approximately 900 km² of area were mapped, distributed in the cities of São João do Piauí, Campo Alegre do Fidalgo, Capitão Gervásio Oliveira and Dom Inocêncio, in the State of Piauí.<\/p>\n
With the purpose of making the existing products compatible, ESTEIO performed a confirmation of the existing landmarks coordinates based on the documentation provided by VALE.<\/p>\n
Basic support, supplementary support, monument location, GPS measurement and geometric leveling implementation activities were developed.<\/p>\n
LASER Profiling<\/p>\n
To meet the altimetric data collection requirements, ESTEIO has used, for the Piauí Nickel Project, the LASER Profiling technology using the LEICA ALS50 <\/strong>equipment.<\/p>\nFollowing the example of the photo flight, data from LASER flight were submitted to a preliminary verification, with the purpose to confirm the quality of the information.<\/p>\n
After the preliminary verification of the flight quality, the standard inspection was performed, quoting as main details, observing the following:<\/p>\n
\n- \n
\n- Presence of clouds or shade;<\/li>\n
- GPS;<\/li>\n
- IMU;<\/li>\n
- Lateral Overlapping;<\/li>\n
- Points density;<\/li>\n
- Analysis result (approved\/not approved).<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
With LASER survey data processed, a LAS binary file was obtained with information from all pulses. These data are converted into ASCII files with xyz extension.<\/p>\n
Having the ASCII files with ENHi coordinates as information source, we had the LASER signal return, and it was possible to generate composition images.<\/p>\n
The composition image, a hypsometric image merged with an intensity image, allows viewing the altitude and highlighting the region’s details, in this specific case we were able to highlight with high quality the region’s vegetation and hydrography.<\/p>\n
The composition image was chosen by VALE as final product for delivery, so hypsometric and intensity images were used only to generate composition images (see model next). <\/p>\n
Based on LASER data, contour lines with 1 meter interval were also delivered.<\/p>\n
Already filtered and cleared DTM data formed the LASER points cloud referring to the terrain. These points, treated as TIN (Triangle Irregular Network) algorithms, are inserted in the process to form triangles and consequently create contour lines. <\/p>\n
With the purpose to validate LASER activities, altimetric control points were performed in the Field, in addition to GPS surveys for LASER profiling flight base.<\/p>\n
In order to prove the quality of the DTM generated, 152 points distributed along the area were compared. The service was executed observing the quality and reliability, and within topographic tolerances according contract specifications.<\/p>\n
Products Generates<\/p>\n
LASER Profiling and aerial photogrammetric coverage results enabled the confection of the following cartographic products:<\/p>\n
\n- \n
\n- Product in 1:5,000 scale, with contours at every 1 meter;<\/li>\n
- Product in 1:20,000 scale with contours at every 10 meters;<\/li>\n
- Orthophotos, added as background in products in 1: 5,000 and 1:20,000 scales; <\/li>\n
- Composition images (hypsometric + intensity), added as background in products in 1:5,000 and 1:20,000 scales;<\/li>\n
- DVD Video of the regions regarding Limestone Area − Mine Area Road and Collection area − Mine Area, in addition to the area referring to São João do Piauí − Mine Area Transmission Line.<\/li>\n
- DEM, DTM and LAS points files (points above the terrain).<\/li>\n<\/ul>\n<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"
[IMAGEM_CAROUSEL] The Piauí nickel reserve is located at Brejo Seco, in the city of Capitão Gervásio de Oliveira, southeast of the State of Piauí, about 50 km away from the …<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2078,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2282","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.esteio.com.br\/en\/wp-json\/wp\/v2\/pages\/2282","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.esteio.com.br\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.esteio.com.br\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.esteio.com.br\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.esteio.com.br\/en\/wp-json\/wp\/v2\/comments?post=2282"}],"version-history":[{"count":5,"href":"https:\/\/www.esteio.com.br\/en\/wp-json\/wp\/v2\/pages\/2282\/revisions"}],"predecessor-version":[{"id":4186,"href":"https:\/\/www.esteio.com.br\/en\/wp-json\/wp\/v2\/pages\/2282\/revisions\/4186"}],"up":[{"embeddable":true,"href":"https:\/\/www.esteio.com.br\/en\/wp-json\/wp\/v2\/pages\/2078"}],"wp:attachment":[{"href":"https:\/\/www.esteio.com.br\/en\/wp-json\/wp\/v2\/media?parent=2282"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}