How To Download Image From Global Mapper
Lorean Hoefert
Select a picture point with the digitizer tool to see the option to Place Picture Image on map... in the right click context menu. This is also available from the Digitizer top level menu under Advanced Operations. Placing a picture on the map is useful for creating a locator or site map with embedded images that display points of interest (POI).
After selecting to manually rectify the image from the prompt in Global Mapper, the rectification window will open. With three data view windows, the rectification window can be resized or maximized for best use. Working from left to right, the three data viewers in the rectification window are the unreferenced data overview, the zoomed view of unreferenced data, and the reference data view. Both the zoomed view of unreferenced data and the reference data view can be zoomed and panned within and will be used for the placing of control points.
It is common for imagery from higher-end sensors, such as satellites, to be distributed as individual bands in separate layers. Each band represents a section of the electromagnetic spectrum, such as color, infrared, or near-infrared. By default, when loaded into Global Mapper, separate band layers will display in grayscale. To see or process the image as a whole, the bands can be combined into a single image. For example, you can combine the red, green, and blue bands together to create a true color image, or create image rasters that have four or more (multi-spectral) or more than 10-15 (hyperspectral) bands.
The highest quality orthoimages can be obtained by first running the Pixels to Points tool to generate a detailed point cloud of the scene. Once the Pixels to Points tool has been run, the orthorectification tools will use the corrected camera positions. This adjusts the camera roll, pitch and yaw based on the alignment determined during reconstruction. It also adjusts the camera height based on the reconstructed scene and any referenced height information such as Ground Control Points or a Ground Height value. The lens distortion is also removed from the images based on the specified Camera Type.
Regardless of which options you select, you will then be allowed to rectifyeach image in turn using the Image Rectifier dialog,while is described in detail later. As you rectifyeach image, it will get added to the Reference Images view in the Image Rectifier dialog, allowing you to selectground coordinates from it for subsequent images. This allows you to ensurea good fit between adjacent data files.
The Image Rectifier dialog is the heart of the image rectification process.This dialog contains everything that you need to rectify an image, from graphicalviews of the image, to lists of ground control points, to an Options menu forselecting the rectification and resampling methods to use. Each part of thisdialog is covered in detail below.
This portion of the dialog is where you actually enter the ground control points (GCPs)that define where the image is on the earth. Typically, you will click a positionin the zoomed view to fill in the pixel coordinates, then manually enter theground coordinates into the X/Easting/Lon and Y/Northing/Lat data fieldsor else select a point from the Reference Image view for the ground coordinates.
Anyway, I tried exporting from Geocompressor new versions of the .ecw with different backgrounds (white and black assigned as the transparency band), but no luck until I can across your tip about using an image clip. Problem solved.
I have recently made a survey using both the automatic option and the single point option within the reach view app. Exporting the points as CSV files and with a few modifications to the spreadsheet in excel (removing unwanted columns, placing the data into individual columns, creating a text file) the data can be uploaded successfully to Global Mapper in the correct positions, as the image indicates.
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I am not getting the same results when I upload the LLH files from the automatic survey and follow the same process. The points upload but are geographically incorrect, 9000km incorrect to be exact.
This is the data uploaded to excel, which seems to have less data than the single-point survey.
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Is there something missing in the data from the automatic survey or am I missing a step?
Alex Diamond is the Director of Products and Engineering at Carbon Mapper, where he leads product vision and execution across large-scale satellite data pipelines and front-end software for GHG emissions monitoring. Previously, he held management roles at Descartes Labs and DigitalGlobe, and co-founded RS Metrics, where he helped pioneer commercially viable quantitative information derived from satellite imagery. Alex possesses a deep understanding of geospatial data and sensor-derived analytics and holds a Bachelor of Arts in Geography & GIS from the University of Illinois at Urbana-Champaign.
David Stepp is a Data Engineer at Carbon Mapper. Before joining Carbon Mapper, he was GIS Developer at RS Metrics for 9 years where he was involved with creating satellite imagery ordering and processing pipelines using open source software. He helped create satellite analytics products for monitoring traffic at retail locations, for understanding global metal ore storage at ports, and for quantifying greenhouse gas emissions at specific factories. David started his career working as Customer and Technical Support at DigitalGlobe (now Maxar). David has a B.S. in Geographic Information Science from Murray State University.
The first version of the ASTER GDEM, released in June 2009, was generated using stereo-pair images collected by the ASTER instrument onboard Terra. ASTER GDEM coverage spans from 83 degrees north latitude to 83 degrees south, encompassing 99 percent of Earth's landmass.
An additional global product is now available: the ASTER Water Body Dataset (ASTWBD). This raster product identifies all water bodies as either ocean, river, or lake. Each GDEM tile has a corresponding Water Body tile.The GDEM and ASTWBD are available for download from NASA Earthdata and Japan Space Systems.This ASTER product is available at no charge for any user pursuant to an agreement between METI and NASA. For more information about the GDEM, see the Validation Report: ASTER GDEM V2 Validation Summary Report.
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