What is an orthophoto?
An orthophoto or orthophotograph is an aerial photograph that has been geometrically corrected ("orthorectified") such that the scale of the photograph is uniform, meaning that the photo can be considered equivalent to a map. Unlike an uncorrected aerial photograph, an orthophotograph can be used to measure true distances, because it is an accurate representation of the earth's surface, having been adjusted for topographic relief, lens distortion, and camera tilt.
What does the resolution mean?
The resolution used to describe orthophoto is the amount of ground distance each pixel of the image covers. The smaller the resolution the more detail in the image. For example in a 15cm resolution image you would be able to identify man hole covers, catch basins and people.
What are MrSid and ECW files and which format should I download?
MrSid and ECW are compressed file formats that are optimized for aerial imagery. These formats allow us to provide clients high-resolution georeferenced imagery without sacrificing disc space or bandwidth. The file format depends on the application used, ESRI products (ArcMap) support MrSid while most AutoCAD applications support ECW. Both MrSid and ECW have a variety of plug-ins that can be downloaded.
For more details see:
MrSid - http://www.lizardtech.com
ECW - http://www.erdas.com/products/ERDASERMapper/ERDASERViewer/Details.aspx
ECW Plug-ins - http://www.erdas.com/products/ECWPlugins/Details.aspx
MrSid Plug-ins - http://www.lizardtech.com/downloads/viewers.php
How long will it take to process my order?
Within ten minutes of completing your order, you will be notified via email that your data is ready for download. Every ten minutes the MapWarehouse runs an automated process that collects all the data for pending orders and aggregates them into a single zip file.
How can I add First Base Solutions imagery to a report or presentation when I don’t have any GIS software?
To add First Base Solutions imagery to a document / presentation you can download the orthophoto as a JPEG/wld format from the Mapwarehouse. The .wld file that comes with the JPEG is necessary when using the orthophoto in a CAD/GIS program.
How do I download my purchased data?
Once you have been notified that your data is ready for download, you can log into the MapWarehouse and navigate to MyAccount -> Order History using the drop downs in the menu bar. The Order History page will appear providing you with a list of your past orders. Each order will have a "download" option that you can click to initiate the download of your zip file.
I am at the check out step viewing my Order Summary and see that I have more items than I require. How do I remove items that I have accidentally added to my shopping cart?
If you have noticed more tiles in your shopping cart at the check out stage, you will have to go back and view the shopping cart by clicking the Get Maps tab. Click on the drawer tab called Shopping Cart located on the bottom right-hand corner. Each item has an icon that looks like a trash can at the end of the line. Click on the trash can to delete the specific item.
If you cannot identify the item to delete, click on the magnifier to zoom to the location of the item.
Now you can continue with the check out process.
Why do I have to purchase the data by credit card when my Company has an account?
First Base Solutions' has a policy in place since 2007 where all orders under $500.00 must be paid by a credit card. If your Company has an account with First Base Solutions then any orders above $500.00 can be paid for by using an account and an invoice will be sent.
How do I know if the TRCA Flood Plain maps are up-to-date?
The TRCA Flood Plain maps are available to purchase and download through our MapWarehouse website. Some of the maps are still in a DRAFT status. To check the status of the maps that you want to order do the following:
1. Search or locate on the main map your area of interest.
2. Use the polygon or point selection tool to identify your site.
3. If there is a TRCA map for your location, this will appear in the section called 'Item Selection'.
4. Click on the 'i' icon (view item info) directly beside the item number.
5. A small window will appear with the item information.
6. The status will be Final or Draft.
7. Look at the comments to see if it states "Unavailable - Contact TRCA"