![]() ![]() To view the aerial view of the current map location, you need to select an aerial year to display. However, you likely came here to view some historic aerial imagery, not to view maps, right? Maps are used for orientation, and we don't deviate from their utility. To zoom in, click on the plus, to zoom out, click on the minus. On the upper left side of the viewer content area are the zoom controls, indicated by the plus ( +) and minus ( -) sign. ![]() The text search box works for street addresses, cities, and even landmarks. Your map should now display with a center location in Fargo, North Dakota. see that text box in the upper left of the viewer with the text ' geo coordinates or street address'? Click on that text box and type Fargo, North Dakota, then click the ' go' button to the right, or press the key. Panning to Fargo, North Dakota from Yuma, Arizona might take awhile. That's all well and good you say, but the world is a big place. To move the map, drag it by clicking and holding down the left mouse button (or only mouse button if on a Mac.) With the mouse button pressed over the map, move the mouse and the map will pan. Otherwise, you will be dropped off in Tempe, Arizona where our headquarters is located. ![]() If you chose not to block your location, the default area will be your current location, or more specifically, the location of your Internet provider. To move this guide to the side of the screen, just click and drag the heading of the popup window to wherever you want it.Ĭhances are, you aren't interested in the area we present to you by default. You can keep it on the screen while you try our suggestions. Move the mouse around and try clicking on things. To help you scale this short (we hope) learning curve, we have compiled this list of common tasks. If you haven't worked any mapping websites, operation might not be obvious to you. Especially sites as unique as Historic Aerials. oblique imagery.We admit it, websites can be confusing. Given the wide range of potential cameras the calculated values should be treated as estimates and not as absolute truth.įor reference, here is the the classic diagram from every remote sensing textbook on nadir vs. ![]() Obligatory disclaimer.The calculations are basic trigonometric functions that do not take into account other variables like lens distortion.As a rule-of-thumb, the horizontal field of view for your camera should be 70 degrees or less. GoPros or the wide angle lenses on the early DJI Phantom platforms). It only works for standard cameras, and will not work for super wide angle lens (e.g.That being said, this script can be used to get a ballpark estimate for low-oblique imagery. the pixels close to the camera have a higher spatial resolution than the pixels far away). Once you get away from nadir (low or high oblique) pixel resolutions change with the depth of field (i.e. It's only for nadir (downward-facing) imagery.So, here is a brand new Python script to do all the calculations for me (and you). But, I needed a more streamlined script for some of my current work with UAVs. I wrote a Matlab script for some helicopter aerial photography as part of my dissertation research. I've often needed to calculate/predict the spatial resolution for aerial imagery collections that I do (the life of a remote sensing researcher). ![]()
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