Abstract: A method, system, and article of manufacture provide for an interactive geographic information system on a thin client. Geographic information may be viewed and interacted with on the thin client. The information is available while the thin client is connected or disconnected to/from a network. The thin client has functionality commonly available in a standard client including raster maps for multiple zoom levels of multiple tiles, raster zooms, selectable vector geometry, geo-referencing information for map navigation, metadata in the form of layer definitions, links to object attributes in databases, links to object reports generated by corporate web servers, uploadable, sharable redlining data, offline access, and a compact database.

Abstract: One or more embodiments of the invention provide for an interactive geographic information system on a personal digital assistant (PDA). The system enables the viewing and interaction with geographic information on a PDA. Such information is available while the PDA is connected to a network (i.e., online) and while disconnected (i.e., offline). Embodiments provide the PDA with the functionality commonly available in a standard client comprised of a complete computer system. For example, embodiments provide raster maps for multiple zoom levels, with each zoom level comprising multiple tiles allowing for “virtual roaming” across a map. One or more embodiments also provide raster zooms (by scaling existing raster tiles), selectable vector geometry (for interacting and highlighting with user objects), geo-referencing information for map navigation, meta-data in the form of layer definitions (visibility, display attributes, etc.

Abstract: A system and process for scaling a binary image. The present invention includes a prestored set of scaler, or look-up, tables that each map all combinations of a specified number of input bits into a specified number of output bits. A sequencer is generated to direct the column scaling of the image. The sequencer includes a bit-string wherein each bit specifies the selection by a scaler function of a scaler table allowing interpolation of a preselected scale factor. The sequencer also includes information that allows the efficient processing of image data by aligning processed data on memory boundaries of a computer. The present invention may be used by an image memory management system or an image processing application to rescale images at high speeds on a conventional computer.

Abstract: An image memory management system for tiled images. The system defines an address space for a virtual memory that includes an image data cache and a disk. An image stack for each source image is stored as a full resolution image and a set of lower-resolution subimages. Each tile of an image may exist in one or more of five different states as follows: uncompressed and resident in the image data cache, compressed and resident in the image data cache, uncompressed and resident on disk, compressed and resident on disk and not loaded but re-creatable using data from higher-resolution image tiles.

Abstract: A hybrid image editor for editing raster and vector entities with a common set of vector edit operations. Raster and vector entities are stored in a single image layer. Raster entities are selectively converted to vector entities. Converted entities are selectively erased from an image comprising multiple, overlapping raster entities.

Abstract: An image memory management system for tiled images. The system defines an address space for a virtual memory that includes an image data cache and a disk. An image stack for each source image is stored as a full resolution image and a set of lower-resolution subimages. Each tile of an image may exist in one or more of five different states as follows: uncompressed and resident in the image data cache, compressed and resident in the image data cache, uncompressed and resident on disk, compressed and resident on disk and not loaded but re-creatable using data from higher-resolution image tiles.