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Didger 4

Detailed Description

Didger 4

Didger 4

Discover the Ultimate Geoprocessing Toolbox!

All the advanced features you need in a low-cost, unbelievably versatile program


One Program - Innumerable Uses

There has never been a more comprehensive, powerful, all-in-one software solution that provides an easy-to-use and intuitive user interface for digitizing, geographic referencing, reprojection, tiling, and mosaicking. Didger solves the problem of combining data files in different coordinate systems, by providing extensive tools to transform the data into one cohesive coordinate system. You can use Didger to precisely convert paper maps, graphs, aerial photographs, or any other plotted information into a versatile digital format that you can use with other software. Didger can create new maps from the ground up or edit any map, drawing, image, or data set imported into it.

Uses for Didger

Start processing your data quickly and accurately with Didger. Some applications for Didger include:

  • digitizing points, polylines, and polygons, such as oil and gas wells, monitoring wells, wireline logs, graphs, contour lines, aerial photographs, satellite images, seismic lines, roads, property boundaries, buildings, sample locations, faults, rock formations, vegetation boundaries, and animal habitats
  • calculating areas of polygons, such as watershed or lake areas
  • calculating lengths of polylines, such as shorelines, roads, streams, or migratory routes
  • georeferencing and/or mosaicking aerial photos or scanned images
  • converting the projection of scanned images, vector files, data files, or Surfer GRD or DEM files
  • overlaying vector, data, and image files to create a complete map
  • and much more!


Didger makes it easy to quickly extract the data you need from images. Import an image, such as a USGS Digital Raster Graphic, and Didger can automatically pick out and digitize the contour lines in seconds (digitized in yellow above). Assign elevations to the contours and with just a few clicks import the contour data directly into Surfer as a colorful and customizable contour map, ready to overlay or combine with other data.

Some of Didger's Superb Features

  • Digitize any map, graph, aerial photo, site map, or printed image regardless of size using any Wintab32 compatible tablet.
  • Digitize a vector or raster project onscreen.
  • Digitize directly into a vector project using a GPS unit.
  • Display all the raw data being sent form the GPS unit or save it to a data or text file.
  • Average the data from the GPS over x number of sample points.
  • See the current position of the satellites that are being used for a lock for the GPS.
  • Display all GPS displays and settings.
  • View the current elevation with the GPS unit.
  • Thin and smooth objects by selecting point selection removal, deviation distance, vertex averaging, or spline smoothing options.
  • Reshape objects by adjusting individual nodes.
  • Combine, split, and/or reverse islands and lakes.
  • Merge two polygons together, or create a polygon from the intersection of two polygons.
  • Import any vector file and retain or apply up to 23 map projections. Projections supported are: Universal Transverse Mercator (UTM), State Plane 1927, State Plane 1983, Albers Equal Area Conic, Azimuthal Equidistant, Eckert IV and VI, Equidistant Conic, Equidistant Cylindrical, Gauss-Kruger/Gauss-Conformal, Lambert Azimuthal Equal Area, Lambert Conformal Conic,   Mercator, Miller Cylindrical, Molleweide, Orthographic, Polyconic, Robinson, Robinson-Sterling,   Sinusoidal, Stereographic, Transverse Mercator, and Unprojected Lat./Long.
  • Specify one of over 200 datums for your project.
  • Convert the projection of a bitmap in a raster project.
  • Warp, or rubber sheet, your calibrated raster image to fit any calibration units.
  • Import a georeferenced bitmap into a vector project and overlay it with other data or vector files, or   tile it with other georeferenced bitmaps.
  • Add a graticule or a grid automatically to your project.
  • Display the coordinates of selected objects in the Coordinate Manager.
  • Define a polygon and use it to clip a bitmap
  • Specify up to 256 colors to be transparent for a bitmap.
  • Export directly to Surfer using the Create Surfer Base Map command.
  • Use the Create Post Map option when importing a data file.
  • Organize your data into different layers with the easy-to-use Layer Manager.
  • Select objects with And/Or criteria.
  • Resample polylines at a specified interval along either the X or Y axis.
  • Use the built-in scanning features to import a bitmap using any TWAIN compatible scanning device.
  • Import vector or raster files using any of the 27 formats that Didger supports.
  • Import data points from 9 different data formats.
  • Export vector or raster files using any of the 23 formats that Didger supports.
  • Import and export spatially referenced images including GeoTIFF, TFW, and RSF.
  • Calibrate your project using Cartesian or Projected coordinate space types.
  • Specify map datum parameters and perform datum transformations using the following methods: Molodensky, Bursa-Wolfe, DMA Multiple Regression Equations (RME), and user defined.
  • Specify projection parameters when importing data or vector files.
  • Combine vector maps from different projections into a single map projection.
  • Digitize different cultures on separate layers and export only selected layers.
  • Use Didger data with Surfer®, Grapher™, MapViewer™, or any other mapping, graphing, or database application.
  • Associate and display up to four data values or identifiers for each object.
  • Use any units (feet, angstroms, miles, meters, kilometers, etc.) with any combination of linear or logarithmic axes.
  • Determine allowable error for your project and work within acceptable standards based on statistical calibration analyses.
  • Obtain length information from polylines.
  • Obtain polygon area and perimeter length.
  • Zoom in or out to display any portion of the project.
  • Set project limits for the extent of your project, or let Didger define default limits.
  • Automatically assign IDs or assign data as you digitize.
  • Edit polylines and polygons with the numerous editing tools.
  • Define tolerance settings controlling the chaining and sensitivity of polyline and polygon creation.
  • Get immediate help for all aspects of Didger, including useful digitizing examples, from the extensive online help system.
  • Use the highly accurate and simple-to-use Tablet Calibration Wizard using between 3 and 256   calibration points.
  • Receive unlimited technical support for as long as you own Didger.
  • Create and print a report of all or selected objects in your Didger project.
  • Print the entire map in full color.
  • Use the mouse, the digitizing tablet pointer, or both while completing project work.
  • Enjoy over 440 Megabytes of Digital Line Graphs and Digital Raster Graphs for the Grand Canyon, Rocky Mountain, and Yellowstone National Parks included on the CD.
  • Enjoy over 80 Megabytes of boundary files, including boundaries for US 3- and 5-digit ZIP codes, US states, US counties, US State Plane delineations, US city point locations, and world countries.
  • And much more!

Digitizing Options

The process of creating new digital information often starts with a paper map, graph or log, or a digital image such as an aerial photo, satellite imagery or scanned paper map. Didger provides an easy and complete solution to digitize vector data from your source documents and files by using a powerful set of manual and automatic tools. You can digitize text, points, polylines, polygons, rectangles, circles, spline areas, spline polylines, and wrapped polylines. Didger supports four ways to digitize information:

1. Full Automatic Digitizing!  Didger supports advanced raster to vector conversion for automated map digitizing! This means that one command will automatically convert your scanned map, image, or drawing to vector formats quickly and at high quality. This eliminates the need for slow and inaccurate manual digitizing of detailed lines – let Didger do it for you! The lines and polygons are extracted and displayed right on top of the image for you to verify and edit. Didger also boasts a full line of preprocessing options for finer control over the vectorization process so you can get the best possible results!

A georeferenced USGS Digital Raster Graphic was imported into Didger 4 (left).
The contour lines were detected and automatically vectorized to red polylines (right).

2. Manual Onscreen Digitizing!  You can perform onscreen digitizing using an imported vector file or imported image file. Performing heads-up digitizing has never been easier. You simply draw the object on the screen using your mouse. You can zoom in and out, or pan the screen while digitizing so you can always see clearly what you want to digitize. 

In this example, the boundary of the Modoc Plateau
in Northern California being digitized in blue from a 
calibrated raster image of the geology of California.

3. Tablet Digitizing!  You can digitize hard copy documents using any Wintab32 compatible digitizing tablet. Nearly all digitizing tablets work with Didger. Simply put the document on the tablet, step through the intuitive Tablet Calibration Wizard to define a coordinate system, and you are ready to go!

You can digitize paper documents with a
digitizing tablet and a puck or stylus.

4. GPS Digitizing!  Any NMEA compatible GPS device connected to your computer's serial port can be used as a digitizing device in Didger. Once the GPS is set up to communicate with Didger, you can begin digitizing over any map. Use the GPS for a "moving map" effect to automatically move the map as you travel. You can use your GPS unit to digitize your position, well locations, fence lines, roads, streams, drainage lines, tree lines, crop boundaries, sample locations, trails, or track your route real-time directly onto your map! 

Digitize points, polylines, and polygons with your GPS unit! View your current elevation, see the current position of the satellites that are being used for a lock, display the raw data being sent from the GPS, and set the GPS input datum in the GPS Commander dialog box.


Raster Based Maps

With Didger you can perform onscreen digitizing using an imported bitmap or an image you scanned using Didger's scanning functionality. Performing "Heads-Up" digitizing has never been easier. Didger has all the functionality necessary to import or scan in a bitmap and calibrate the image in real world coordinates using one of ten georeferencing methods.

Once the image has been calibrated, Didger allows you to digitize points, polylines, and polygons with ease. You can export the digitized objects with the image in GeoTIFF format. Or, simply export the digitized objects without the underlying bitmap and still retain the georeferencing information. Use the numerous bitmap filtering options on the bitmap to make identifying and digitizing the objects a breeze.

The graphic above shows the boundary of the Modoc Plateau in Northern California being digitized in blue from a calibrated raster image of the geology of California.

Georeferenced Raster Based Maps

A georeferenced raster image retains all georeferencing parameters. When you import a georeferenced raster image, you can skip the calibration process and start digitizing immediately. You can import a georeferenced raster image into a vector or a raster project.

If you import a georeferenced bitmap into a vector project, you can overlay it with other data or vector files or tile it with other georeferenced bitmaps.

Import georeferenced bitmaps into a vector project and then overlay it with data and vector files.

If you import a georeferenced bitmap into a raster project, you can convert the projection of the bitmap (if it contains a projection) or you can warp (rubber sheet) the image to fit your calibration points.

Import a bitmap into a raster project, calibrate it, and warp it to fit the calibration points.

Didger also supports importing and/or exporting ESRI World Files [TFW] and Blue Marble [RSF] files when exporting georeferenced bitmaps. This is a powerful and advanced feature of Didger!
Vector Based Maps and Data Files

With Didger you can import a variety of vector based maps and data files in many formats. Create large coverages easily by importing several vector or data files into one project. The files will align according to their coordinate systems. Digitize new features onto an existing vector plot from your digitizing tablet and map, or digitize onscreen. Change line styles, object IDs, and add labels to objects with ease. Even import different files onto separate layers!

If the files are projected and contain different projection information, they will be converted to the projection of the first imported file using a datum transformation. You can also convert vector or data files from one projection to another.

This graphic shows three vector files and a data file imported into a vector project in the Lambert Azimuthal Equal Area projection.

Map Projections and Coordinate Conversions

Converting data from one coordinate system to another is one of Didger's advanced features. Didger supports over 20 projections and over 200 datums. Easily calibrate or import your files using one of these projections and convert your coordinates between them. For example, with a few simple steps Didger can transform your Lat/Long point data into Universal Transverse Mercator (UTM) coordinates to be used by other mapping applications. All supported projections include:

  • Albers Equal Area Conic Orthographic
  • Azimuthal Equidistant Polyconic 
  • Eckert IV Robinson 
  • Eckert VI Robinson-Sterling
  • Equidistant Conic Sinusoidal
  • Equidistant Cylindrical State Plane 1927
  • Gauss-Kruger/Gauss Conformal  State Plane 1983
  • Lambert Azimuthal Equal Area Stereographic
  • Lambert Conformal Conic Transverse Mercator
  • Mercator  Unprojected Lat/Long
  • Miller Cylindrical  UTM
  • Mollweide  
In addition to projection and datum transformations, Didger can also convert coordinates of vector projects by utilizing either a math or georeference operation. Converting coordinates by applying a simple math operation allows the user to specify a value to add, subtract, multiply, or divide to the current vector project. Advanced georeferencing conversion is also available. By specifying the source and destination coordinates of the vector project, Didger's georeferencing methods allows the user to convert the current project to the new destination coordinate system. The possibilities are endless and the flexibility is astounding!

Create stunning world maps in a variety of projections to convey your information easily. The graphic above uses the Equidistant Conic projection.

Advanced Editing Features

  • Create line intersections from overlapping polylines.
  • Snap undershoot polylines and trim overshoot polylines.
  • Create polygons by using a polygon locator in the center of linked polyline objects.
  • Reshape polylines and polygons.
  • Create complex polygons.
  • Thin and smooth polylines using one of four different methods.
  • Resample polylines to specified intervals.
  • Break or Trim polylines.
  • Convert polylines to polygons and vice versa.
  • Connect polylines.
  • Create polygons by locator or by ID.
  • Merge two polygons together, or create a polygon from the intersection of two polygons.
  • Combine, split, and/or reverse islands and lakes.
  • Select up to 256 colors to be transparent for a bitmap.
  • Sharpen bitmaps, or adjust the brightness, contrast, and saturation.
  • Apply Median or Spatial filters to bitmaps.
  • View the coordinates of selected objects in the Coordinate Manager.
  • Edit the coordinates of selected objects in vector projects in the Coordinate Manager.

Import and Export Formats

Many sophisticated import and export filters come with Didger, simplifying the transfer of your data and images to and from your other applications.

  • Spatially Referenced formats: GeoTIFF, TFW, and RSF.
  • Vector Import formats: EMF, GSI, GSB, BNA, DLG, LGO, LGS, DXF, PLT, BLN, CLP, WMF, SHP, MIF, DDF, E00.
  • Raster Import formats: TIF, BMP, TGA, PCX, GIF, WPG, DCX, EPS, JPG, PNG, PCT.
  • Data Import formats: XLS, SLK, DAT, CSV, TXT, BNA, WKx, WRx, BLN.

Important News about Digitizing Tablets

Nearly all digitizing tablets work with Didger. If you already have a tablet, Didger requires a 32-bit WinTab compliant digitizing tablet driver, available from most tablet manufactures (for no charge) or from third party vendors.

If you don't currently own a tablet, you shouldn't be discouraged. The price of new, high-resolution digitizing tablets is astonishingly low. And with Didger's capabilities, large maps are easily digitized in a single project so even smaller tablets work quite well.

System Requirements

PC running Windows 95, 98, Me, NT4 SP3, 2000, XP and higher
25 MB of free hard disk space
32 MB RAM minimum, 64 MB or higher recommended
800 x 600 minimum monitor resolution

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