To export your AOI as tiles in JPEG, JPEG2000 or GeoTIFF format:
- Start the export
- Select the Export type as Advanced.
- Select the Content type as 2D (Tiled).
- Complete the steps described below.
Projections with metric units of measurements will have a tile size of 1.5 square km, otherwise the tiles will be 1 square mile each.
Selecting the area to export
Select the area you would like to export and re-position it if it's required. This is your Area of Interest or AOI. You can upload a GeoJSON file of your AOI. Note that this AOI gets deducted from your total export allowance area.
Alternatively, select a point on the map to start defining your area. Draw a polygon for your AOI by clicking at different points that indicate the boundary of your area.
Selecting the projection
Projection is an important setting. When the spherical Earth is "projected" onto a flat map surface, distortions occur. Like Google, Bing, and MapQuest maps, we use Spherical Mercator (EPSG:3857, also known as EPSG:3785 and EPSG:900913) in MapBrowser. This maps the sphere to a convenient rectangle, but has large distortions away from the Equator.
Select the relevant projection Projection for your export. The list of available projections depends on the location you are viewing and want to export.
NOTE: When saving images, we recommend using an available local map projection so that scale and measurements are accurate.
Selecting the resolution (GSD)
Choose the resolution (GSD) you want for the exported image. GSD is the area on the ground represented by each pixel in a digital orthoimage. The smaller the pixel, the more detail visible in the image. MapBrowser allows for exports at 7.5, 15 and 30 cm GSD.
Note that higher the GSD (lower value), the longer your export will take. For example, an AOI export at 7.5 cm GSD will take longer than an export at 30 cm GSD.
Selecting the format
Select the imagery Format for the export from GeoTIFF, JPEG or JPEG2000.
The estimated export size (area) is displayed in the Summary section.
Selecting ImpactResponse surveys
If you have a subscription for Nearmap ImpactResponse and would like to export imagery from corresponding surveys, select Add ImpactResponse Surveys.
Usually, the exported imagery comprises multiple surveys that are layered in a way that the most recent survey is on the top.
If you select a post-catastrophe survey in MapBrowser, this survey will be at the top and other surveys will be used to fill in any gaps in the AOI if needed.
Viewing the export summary
Once you select all the options, you'll see the export summary.
For a tiled image, you'll see the following information:
- Export allowance hat you have available
- Estimated export size, which is the total area of export in sq km
You can use this to estimate the export area available to you for future exports.
Reviewing your export
Click REVIEW EXPORT to view more details of your export. The Export Summary dialog is displayed with the following details.
If you have purchased a limited amount of area for export, you can see how much of your export allowance you will use up in this export and the balance available to you for future exports.
In addition, you can specify a name for the export in this dialog. This name will be displayed in the DOWNLOADS window. This dialog also indicates the approximate time that your export will take.
Click CONFIRM EXPORT to proceed.
Downloading the files
Once you confirm your export,
The DOWNLOADS window is displayed with the progress of your download. Your export file will be available for downloading in the DOWNLOADS window.
NOTE: Downloads will be available for a maximum of 60 days from the date on which they were generated.
The filenames follow this format: Vert<content type> (<format>).zip. For example, VertPhotoMap (JPEG2000).zip or VertGeoTIFF.zip. The zip file contains the following files.
