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.
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.
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
Select the relevant projection Projection for your export.
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.
NOTE: When saving images, we recommend using an available local map projection so that scale and measurements are accurate.
Selecting the resolution and content types
Select a resolution. Choose the resolution you want for the exported image. It is recommended that you select a higher resolution if your image is large.
NOTE: If you save in the Spherical Mercator projection, meters/pixel is only a rough estimate due to that projection's inherent distortions.
Select the imagery type for the export from GeoTIFF, JPEG or JPEG2000.
The estimated export file size 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 (in square kms) available
- Estimated export size, which is the total area of export in sq km
NOTE: By default, the size of each tile in your export in your export is 750m each.
Reviewing your export
Click REVIEW EXPORT to view more details of your export. The Export Summary dialog is displayed where you can specify a name for the export. 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, 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.
