Yes, there is digital mapping available at the following scales:
No. All of our digital maps use NAD83, while many of the paper maps are still based on NAD27. As our division creates new community mapping the paper maps are produced in NAD83. Also, whenever we do revision mapping in a community, the old NAD27 maps are disgarded and replaced with the new NAD83 maps.
No. All of our resource maps (i.e. 1:250,000 & 1:50,000) are fully structured. All new community mapping (i.e. 1:5,000 & 1:2,500) are fully structured, however, we do have approximately 1900 community maps that are scanned & vectorized, but are not structured. All of the data contained in these files are on the same theme and have the same feature code.
Yes, there is. Click here.
Click UTM Zones for a diagram showing the central meridians, zone widths and projection parameters.
Click MTM Zones for a diagram showing the central meridians, zone widths and projection parameters.
Geodetic Surveys is essentially the precise measurement of the earth. Today global positioning technology is the main tool used to accomplish this task. The physical part of this is a network of control survey markers which have been installed and surveyed throughout the province.
There are considerable differences in both the latitude and longitude coordinates and the northing and easting values. These shifts vary considerably with location, and there is no constant shift which can be applied for all areas. The following tables gives an indication of the magnitude of shifts for three areas of the province.
|Geographic Coordinate Shifts from NAD27 to NAD83|
|Port aux Basque||St. John's||Goose Bay|
|Latitude in Seconds||0.03||0.20||0.27|
|Longitude in Seconds||2.33||3.52||3.18|
|MTM Coordinate Shifts from NAD27 to NAD83|
|Port aux Basque||St. John's||Goose Bay|
|Northing in metres||219||213||226|
|Easting in metres||55||73||56|
Yes. The National Transformation Program can transform coordinates from NAD27 to NAD83, while GSRUG can convert between latitude and longitude and MTM or UTM. The National Transformation Program can be obtained from the province by calling (709) 729-3305 and GSRUG, which was developed by the federal government, can be obtained by calling 613-995-4410..
Yes, we do have software that will calculate magnetic declinations. However, we usually refer people to the federal government website called the Canadian National Geomagnetism Program. This site allows individuals to calculate the declinations online.
All of the control survey information for the province has been compiled on a CD. This includes 6100 control survey markers sketches, 165 index maps and software to view, retrieve and print the information. The cost for this CD is $200.00 plus HST.
The North American Datum of 1983 (NAD83) was adopted on January 1,1993. Prior to that NAD27 was used.
Aerial photographs have become common place and are used by resource planners, land-use experts, environmentalists, engineers, scientists, and a wide variety of other users. But many people want a historical aerial photograph for many reasons. To locate the boundaries of their land or to give as a gift. To show change in their area.
The Air Photo and Map Library has coverage of the island and mainland portion of the province dating back to the 1940's. Check with them to see if they have your area. Some of the more productive areas of the province are flown every ten years.
A photographic scale just states that one unit of distance on a photograph is a representation if a specific number of units of actual ground distance. Often expressed in three ways. Unit equivalent, representative fraction or a ratio. For example a photographic scale of one millimeter on the photograph would be 12.5 metres on the ground and would be expressed as: a ratio of 1:12,500, representative fraction 1/12,500 or unit equivalent of 1mm =12.5 m.
Another two terms often confused when discussing scale is large and small scale photos. Large scale photo means that the ground features are larger giving more detailed size but the ground coverage that is seen on the photo is less than in at smaller scale. Small scale photo means that the ground feature are smaller and less detailed. The ground coverage on the photo is greater than the larger scales. The Air Photo and Map Library has a variety of photographic scale available.
Due to the limits of our equipment we can only enlarge the full negative up to 3x or 71cm x 71cm, (28" x 28"). We can enlarge a portion of aerial photograph up to 3x or more depending on the quality of the original negative but due to loss in resolution we have found that 5X gives the best result. The biggest print we can make is 71cm x 102cm ( 28" x 40").
A photo mosaic is a series of aerial photographs that are put together so that the detail of one photograph matches the detail of all the adjacent photographs. There are three main types: controlled, semi controlled and uncontrolled mosaics. Controlled mosaics have the prints tone- matched and rectified to fit a base map and each print must have at least three ground control. The semi-controlled Mosaic has tone matched print but are not rectified and are fitted to a map base of the same scale. Uncontrolled mosaics are prints that are joined together to get the "best fit". They can be tone-matched.
Due to a lack of demand for this service we no longer offer Air Photo Mosaics but can supply you with tone-matched unrectified photos so you can do your own uncontrolled mosaics.
Due to a demand by geomatics professionals we are looking into getting our aerial photographs digitalized but we are not able to offer this service yet. We are still looking into standards and what formats would be best for the customers. We know that digital aerial photographs are becoming available as Tagged Information File Format (TIFF) at resolutions of 600 dpi which means that a B&W aerial photograph would be approximately 30MB in size while the colour photograph would be 90MB. If you have any suggestions, contact the Surveys and Mapping Division at 709.729.3305 or Don Burton at email@example.com