Big John

Cartography Map is communication Four elements in Communication Audience Intent Format Strategy Types of Maps Reference Maps General purpose maps Emphasize physical environment Thematic Maps Maps focusing on a particular topic that is tied to location rather than solely location Example: Choropleth - Quantitative -> Graduated or different colors to show different values Choropleth - Qualitative -> Different colors represent different classifications Flow Maps Arrows show ...

Spatial Analysis What is Spatial Analysis? A geographical analysis which seeks to explain patterns of human behavior and their spatial expression in terms of mathematics and geometry The study of “regularities in the spatial distribution of economic activity, populations, land use, and other dimensions of human activity” Location is Key A hugely important determinant of the quality and characteristics of something - an event, a building - is the location Being able to identify and an ...

Parallel Processing Algorithmic Complexity Linear complexity Polynomial complexity exponential complexity Processing Data with a Divide-and-Conquer Strategy A Divide-and-Conquer Strategy Requires that each piece is independent of the others Speedup with Parallel Processing S=TimeSequentialTimeParallelS = \frac{TimeSequential}{TimeParallel} S=TimeParallelTimeSequential​ Critical Path A critical path in a computation consists of consecutive steps that are interdependent and therefore not ...

Types pf statistical tests Systematic and unsystematic Systematic Reproducible and consistent Has an underlying cause (experimental variable) Unsystematic Random and unpredictable Also known as error IVs and DVs IV: Independent Variable Variable that you think causes the effect on another variable Variable that is manipulated in an experiment DV: Dependent Variable The outcome variable Variable measured in an experiment Types of AB Testing Between-Subjects Participants assign ...

UX / UI and AB Testing UX / UI Design Content Ownership Format Structure Metadata Volume Dynamism UX Honeycomb AB Testing What is AB testing (bucket tests or split-run testing) If you want draw a conclusion about difference between two conditions You can’t randomly assign gender to people (because they have self-identified gender already), so woman and man have difference in X is not a AB testing. Randomized control trial or experiment with two levels: A and B Used to test the impact ...

GNSS What is Global Navigation Satellite Systems A GNSS is a network of satellites and supporting systems that provide locational data for geolocation The modern tool for answering the question: Where Am I? Global Positioning System GPS is the American GNSS: First operational GNSS - first satellite launched in 1978 Created for the military but available to civilians Selective Availability Only lower resolution available to citizens until 2000/2001 Military could limit availability as neede ...

Natural Language Processing for Social Media Social Media Data Source of social media data Collection, pre-processing, and analysis of Social Media Data Data Collection Pre-processing social media data Natural Language Processing tools Normalizers, chunkers and parsers, tokenizers Part-of-speech taggers Language and dialect identification Automatic summarizing Adaption Using specific NLP tools or re-training NLP tools for social media texts Existing NLP tools for English

Map Projections: From 3D to 2d Map Projection = Mathematical Operation Map projection is a mathematical operation that transforms the surface of a 3D ellipsoid to a 2D surface The mathematical operation used for a particular projection is chosen based on the parameters Process (Georeferencing, then Projecting) A two-step process transforms the real world to a map projection: A chosen coordinate system is used to locate real-world features onto the ellipsoid The surface of the ellipsoid is ...

Thinking Geospatially Help computer understand what we need! Geospatial Data Concepts Geospatial Data Location and geometry Attribute Data Information describing the spatial objecets/features Cartographic Data Symbology and arrangement of the representations Reference frameworks Datums, projections Data Acquisition Systems Surveying, GPS Data Models Raster, Vector Functional Models Problem-solving Information Dissemination Visualization, Cartography, Human Interpretati ...

Land Use and Mapping Population Definition of Land Tenure In simple terms, land tenure systems determine who can use what resources, for how long, and under what conditions. Categories of Land Tenure Private : Held by a private party, which could be an individual, corporate body, married couple, etc. Communal: Held by a community in which each member has the right to independently use land Open access: No right are assigned to anyone and no one can be excluded State: A governmental or other ...