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Using Mezurit Using the Sanborn Oblique Analyst viewer
Using Mezurit
Mezurit Intro Tutorial
Available Locations

Prior to logging in, all of the available imagery is displayed on the home page. You can either search for an area or interact with the map to zoom in on the area that you are interested in. The map displays both a marker for the available locations as well as the footprint for the covered area. Clicking on the marker will bring up details for the imagery such as resolution and flight date.

After logging in, the available imagery appears on the map with color markers indicating areas that you are already subscribed to while outlined markers indicate locations which you have not yet subscribed to. Clicking on a marker at this point either takes you to the viewer if you are subscribed to the area or gives you the ability to subscribe to the location.

Subscribing

When you have found a location that you would like to subscribe to, clicking on its marker will allow you to choose your area of interest. You have the option of subscribing to the entire area or specifying a smaller area to subscribe to.

If you would like to subscribe to the entire area, simply click the link for the 'entire imagery area' and select your subscription duration from the options that appear.

If you would like to subscribe to a smaller area (with a 1 square mile minimum), you can either draw the area of interest manually, using the rectangle tool on the upper left of the map, or you can choose to upload a file describing the area of interest. Files can either be GeoJSON or KML. Please note, file uploads with be converted to a bounding box that contains all of the geometry present in the file.

You have the option of giving the subscription an optional project name. This is particularly useful if you are subscribing to multiple areas of interest within the same available location.

Shopping Cart

Once you have decided on a subscription and are ready to checkout, click on the 'Checkout' button or the shopping cart icon at the top of the page.

Individual line items can be modified or deleted before you make your purchase. This includes the ability to change the 'amount' of a subscriptions duration. This is how, for example, you take a one hour subscription and change it to a three hour subscription.

When you are ready to proceed with your order, there are two payment options. The first is to pay by credit card. The second option is labeled 'Pay with Other'. We realize that some orders will be large enough that you may not want to pay with a credit card. If you choose the 'Pay with Other' option, your cart will be saved and a Sanborn representative will contact you regarding alternate payment methods.

Viewing

You can view an area that you have subscribed to from the dashboard. Either click on the color marker on the map that represents your subscribed location, or click on the name of the subscription from the list on the right. Both of these methods will take you to the viewer window for that subscription.

Subscriptions are based on a 'bucket of minutes' approach. If you use 10 minutes worth of viewing one day and coma back again a few days later, you still have 50 minutes available to you for use. There is a minimum usage of 5 minutes - as soon as you enter a viewer, 5 minutes will be deducted from your remaining subscription time. Don't worry though, the viewer will not begin deducting time from your subscription again until 5 minutes have passed.

Using the Sanborn Oblique Analyst viewer
Overview

The viewer let's you view and navigate across aerial photographs. It automatically selects the best photo for your current area of interest and let's you switch between different perspectives such as looking straight down or at an angle to the north, east, south or west.

Overview video on the functionality of the Viewer:

The Viewer has the following major components which are described in detail further on in this document.

Details
Userinterface

Selecting a location will automatically open the alternate views. Clicking or touching the triangular button on the right of the Viewer will open alternate views of the selected location (if you have placed one). Click the triangle again to close.

Selectedlocation

Clicking or touching the 'M' button near the lower-right of the Viewer will open a locator map. Click the 'M' again to close. Map

Locator1
Navigating Across the Aerial Photos
Zooming in and out Zoom

The Viewer supports zooming from a high level overview to close up detail. You can zoom in and out in three ways:

  • Click the + to zoom in or the - to zoom out.
  • With the Pan and Zoom Tool selected, double-click on the photo to zoom in.
  • Using a mouse, roll the scroll wheel away from you to zoom in and toward you to zoom out.

Depending on the size of your browser window, you may see the edges of the aerial photo when your zoomed out the farthest. This is normal and does not prohibit you from moving between photos.

Panning Pan

With Pan and Zoom Tool selected, click/touch and drag the photo in any direction. If another photo provides a better view of the center from the same perspective the Viewer will automatically switch to that photo. This means that you can pan continuously over the ground even though you are viewing only one photo at a time. This switch of photos will appear as a subtle shift in perspective or scale and may not even be readily apparent to you.

The Compass
Northarrow1 Northarrow2

The Compass at the bottom of the Viewer always points to true north. You may notice it turning slightly to maintain its true orientation as you pan across a photo. It also maintains its circular shape relative to the ground. This means that it will be nearly circular in photos looking straight down but will appear increasingly flattened and elliptical as your view moves away from vertical.

The buttons in the outer ring indicate which oblique viewing angles are available. The half circle button in the middle indicates the nadir or top-down view. The triangle button in the center indicates a top-down, north-up navigation view which is also used to view WMS layers.

Changing Perspective

A circular button may be present at the center of the Compass and trapezoidal buttons may appear around its edges. These represent the different perspectives that are currently available for the center of the view. The button that's highlighted in yellow represents the current perspective. Hovering over one of these buttons will give you a quick peek of the photo center from that perspective. Click on the button to switch to that perspective. The Compass will rotate to true north for the new view.

Quickview
Working at a Selected Location

You can place a marker at a particular location on the ground using the Search Tool so that the location is readily apparent as you switch perspectives.

Search

Be sure that the slide-out mode is on Search.

Searchmode
Placing the location at an address

To place the marker at an address, enter the address in the text box within the Search slide-out panel of the Viewer then hit Enter or select from the list that appears. If the address is valid the Viewer will zoom to that address and place the marker. If it's not valid, an error message will appear briefly under the text box. Note that you can only enter addresses within the project area of the aerial photos. In most cases you will not need to specify the city or town name.

Placing the location on a landmark

To place the marker on a landmark, enter the name of the landmark in the text box withing the Search slide-out panel of the Viewer then hit Enter or select from the list that appears. If the landmark is valid the Viewer will zoom to that landmark and place the marker. If it's not valid, an error message will appear briefly under the text box. Note that you can only enter landmarks within the project area of the aerial photos.

Placing the location on a geographic feature

Your viewer may be configured so that you can place the marker on a specific type of geographic feature such as a parcel. If so, you can enter the ID of a feature in the address box. If the feature ID is valid (it must match exactly) the Viewer will zoom to the center of that feature and place the marker. If it's not valid, an error message will appear briefly under the text box.

Also note that your viewer may be configured to draw the geographic features as an overlay on the photos.

Placing the location manually Setlocation

You can place the marker at any location by selecting the Set Location Tool and clicking on the photo. The selected tool will immediately switch to Pan and Zoom after the marker has been placed.

Switching views of the location Location

Thumbnails of all available views of the selected location are provided in the slide-out panel along the right edge of the view. Click on one of these to go to that view centered on the location. The name of that view will be highlighted in yellow until you navigate away from the selected location.

Removing the location Removelocation

To remove from the map the location you placed click on the Remove the current location button.

Understanding the Locator Map

The locator map shows the footprint of your current view as an orange quadrilateral. The footprint of the entire aerial photo you are viewing is shown in blue. These footprints will appear rectangular for aerial photos which look straight down and trapezoidal for side views (see below). The extent of all of the photos in this set will appear as a lightly shaded red area with a thick border. If you have placed a location marker on the main view it will also appear on the locator map.

Locator2 Locator3

The locator map is automatically recentered each time you pan the main view. You can zoom the locator map either by using the scroll wheel on your mouse or by clicking the plus/minus buttons at the left side of the locator map. You can pan by clicking/touching and dragging the map. Note that the entire world is available on the locator map and it is possible to pan far away from your current view. If you get lost simply pan the main view slightly and the automatic recentering will bring the footprint back into view.

Drawing on the Viewer

You can draw shapes and text on the aerial photo. These only exist in your current Viewer session and are not saved. Drawings are placed relative to the ground. This means they will maintain their approximate geographic locations as you change perspectives. Note that text will always draw horizontally and will not rotate with the perspective.

Drawing1 Drawing2
Drawing Points Drawpoint

To draw points click on the Draw Point Tool. Click or tap on the photo to place a small marker.

Drawing Lines Drawline

To draw lines click on the Draw Line Tool. Click or touch the photo repeatedly to create a multi-segment line. Double-click or double-touch to stop drawing.

Drawing Polygons Drawpolygon

To draw polygons click on the Draw Polygon Tool. Click or touch the photo repeatedly to create a polygon. Double-click or double-touch to stop drawing.

Drawing Text Placetext

To draw text click on the Draw Text Tool. Click or tap on the photo at the location of the lower-left corner of the new text. A text input box will appear at that location. Type your text into the box then hit Enter to place the text on the photo.

Erasing your Drawings Removedrawings

If you would like to remove all of your drawings from the view, click on the Remove Drawings Tool.

Making Measurements
Coordinates Showcoordinates

You can get the geographic coordinates of any point on the aerial photo by clicking on the Coordinate Display Tool, and hovering the mouse or touching the location.

Coordinates

The coordinates are only rough approximations. Due to normal distortions in aerial photos and variations in ground elevation the coordinates may be off by several meters from their true values. Also note that the Viewer is not aware of buildings that appear in the photos. Coordinates taken at the apparent top of a building in a side view are actually for ground level behind that building.

Measuring Heights Measureheight

To measure heights of objects on the aerial photos, begin by clicking on the Measure Height Tool. Click or touch the photo and drag to draw a line showing the height. The line will be constrained to moving up and down vertically relative to objects on the photo. Once you have clicked/touched the first point you can move the cursor or you finger away from the line for visibility without interrupting the measurement. Click again or lift your finger to end the measurement.

Note that the lower point, of the line, and not the first point you click, is always considered to be at ground level. This means it's only possible to measure up from the ground, not down into the ground.

Height measurement is disabled when your perspective is looking straight down.

Measuring Lengths Measurelength

To measure lengths click on the Measure Length Tool. Click or touch the photo repeatedly to create a multi-segment line. The length of that line in feet and meters will appear above the cursor. Double-click or double-touch to end the measurement.

Measuring Areas Measurearea

To measure areas click on the Measure Area Tool. Click or touch the photo repeatedly to create a polygon. The area of that polygon in square feet, square meters, and acres will appear in the center of the polygon. Double-click or double-touch to end the measurement.

Measuring Length and Area at Height

The length and area measurements described above are performed at ground level. To make these measurements above the ground, such as on the top of a building, hold the Ctrl-key down when clicking the first point. This will temporarily place you in height measurement mode. Drag the height measurement line to define the height offset then click or touch the points of your measurement shape. The length or area will then be computed at the height you defined above ground level.

Measuring Slope Measureslope

Slope measurement is somewhat more complex than the other measurement functions. For the Viewer to understand where your sloped feature is in 3D space you must identify it from two different perspectives. Follow these steps:

  1. Pan, zoom and change the perspective with the Compass to get the optimal view of the sloped edge.
  2. Select the Measure Slope Tool.
  3. Click two points along the sloped edge, preferably at its visible extremities.
  4. Change the perspective with the Compass.
  5. Click the same two sloped edge points in the same order. As you move to place the second point you will see the slope value expressed three common ways:
    • As a percentage (run * 100 / rise)
    • As an angle in degrees (arctan2(rise, run))
    • As a ratio (1 : run / rise)

You may start or end the slope measurement in a nadir view if necessary.

Copying Measurement Text

While measuring you can use Ctrl-C to copy the current measurement values into the clipboard. You can then paste that measurement text into any document or program.

Measurements as Drawings Removedrawings

All measurements, except for coordinates, persist on the Viewer as drawings. They can be removed with the Erase Drawing button. Because of the change in perspective, height measurements and area/length measurements at height offsets are not perserved when moving between photos.

Working with Layers
Toggling Layers Layers

Shapefiles and WMS feeds can be added as overlay layers. To toggle a layer on and off, click on the Layers button, then click on the layer you wish to toggle on or off. After toggling layers, you can click the Layers button again to close the key.

Shapefile layers will have a color key depicting which layer is a particular color. Currently, the colors cannot be changed within the Viewer.

There are also an assortment of base layers that can be toggled by clicking on any one of them.

The layer categories can be expanded or collapsed by clicking the category title, ie "Overlays" or "Basemaps".

Layersview
Viewing Attributes Viewattributes

The attributes of the shapefile(s) can be viewed by selecting the View Attributes Tool and clicking on the shape(s) in the main window. The attributes (if any are available) will display in the Search slide-out on the left side of the Viewer. This slide-out can be closed by clicking the Search button on the right of the slide-out.

Attributes
Sharing Your View
Creating a PDF for saving or printing Createpdf

You can create an Adobe PDF document of your current view for printing or sharing by clicking on the Create PDF Tool. A new browser window or tab will pop up and the PDF document will appear there. It may take some time to generate and download the PDF so please be patient. Your selected location marker and any drawing visible in the view will also appear in this document. The printing of layers has been disabled at this time.

Getting Additional Help Help

Specific instructions for the use of each Mouse/Touch tool are shown at the top-center of the map.

Still have questions?

Email us: sales@sanborn.com

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