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MapTiler - Map Tile Cutter. Overlay Generator for Google Maps, Google Earth (KML SuperOverlay).

MapTiler - Map Tile Cutter. Overlay Generator for Google Maps, Google Earth (KML SuperOverlay).

Web mapping client comparison v.6 This comparison aims to serve as a basis for those seeking a first approach to Web mapping technologies at the client side. In the sixth version a number of projects have been added and the whole set of clients has been categorized in order to distinguish them better, since there are currently forty four (44) Web mapping clients in the comparison. Web mapping clients play a significant role in Geoportals of Spatial Data Infrastructures (SDI) allowing the visualization of spatial data from several sources. Likewise, these clients may be part of Web-based Geographic Information Systems (GIS) applications, in which users can directly interact with SDI services, visualize, query and integrate them with local data and GIS tools. There exists a wide variety of free and open source software (FOSS) projects that make the creation and configuration of Web mapping clients easier. Below is a graph showing the relation between free and open source Web mapping clients. Advantage, Disadvantage.

bjornharrtell/jsts - GitHub MapTiler и GpsVP Как подготовить готовую растровую карту (или снимок) и работать с ней на наладонном компьютере (КПК). Обсудить в форуме Комментариев — 1 Оглавление 1. Введение Для полевой работы с GPS-устройствами часто бывает необходимо загрузить туда привязанные растры (например, космические снимки, планы лесонасаждений, топокарты) и векторные данные. Используемые программы: MapTiler - для подготовки растровых данных для КПК и в Garmin. 2. Смысл работы заключается в создании геопривязанной мозаики растров с несколькими уровнями детализации. Скачиваем MapTilerи устанавливаем его на настольный ПК. На следующем этапе нужно указать нужный нам растр (поддерживаются TIFF/GeoTIFF, MrSID, ECW, JPEG2000, Erdas HFA, NOAA BSB, JPEG). На следующем этапе нужно определить систему координат и проекцию. Если нас такое определение не устраивает, можно задать проекцию вручную и обязательно нажать Set: Определяем каталог, куда положим готовые растры. 3. Подгрузка растровой карты, созданной с помощью MapTiler

Geography - How Do You Define A Country? When people ask how many countries there are in the world,they expect a simple answer. After all, we've explored the whole planet, we have international travel, satellite navigation and plenty of global organizations like the United Nations, so we should really know how many countries there are! However, the answer to the question varies according to whom you ask. Most people say there are 192 countries, but others point out that there could be more like 260 of them. So why isn't there a straight forward answer? The problem arises because there isn't a universally agreed definition of 'country' and because, for political reasons, some countries find it convenient to recognize or not recognize other countries. For example, Taiwan claims to be a country, but China states that Taiwan is just another part of China. So, how do governments define what makes a country? There are three terms you come across when you try to discover how countries are defined. The Montevideo Convention 1. 2. 3.

Projections on Bing, Google I have lately seen several blogposts confused about which datum and projection Microsoft’s Live Maps (Virtual Earth) and Google Maps use. As most people already know by now, they render the round earth onto a flat screen using a Mercator projection. I think the confusion comes from that they actually use two spatial reference systems at the same time: Geographic Longitude/Latitude coordinatesystem based on the standard WGS84 datum. So when is what used? The Javascript API’s use (1) as input when you want to add points, lines and polygons. If you want to create image overlays, or roll your own tile server on top of the map, you will need to project your images into a spheric mercator projection. Here’s a bit of facts about the two projections: The valid range of (1) is: [-180,-85.05112877980659] to [180, 85.05112877980659]. The valid range of (2) is: [-20037508.3427892, -20037508.3427892] to [20037508.3427892, 20037508.3427892] So why this weird extent for the latitude?

OGR: OGR Simple Feature Library The OGR Simple Features Library is a C++ open source library (and commandline tools) providing read (and sometimes write) access to a variety of vector file formats including ESRI Shapefiles, S-57, SDTS, PostGIS, Oracle Spatial, and Mapinfo mid/mif and TAB formats. OGR is a part of the GDAL library. Resources Download Ready to Use Executables The best way to get OGR utilities in ready-to-use form is to download the latest FWTools kit for your platform. Source The source code for this effort is intended to be available as OpenSource using an X Consortium style license. Bug Reporting GDAL/OGR bugs can be reported, and can be listed using Trac. Mailing Lists A gdal-announce mailing list subscription is a low volume way of keeping track of major developments with the GDAL/OGR project. The gdal-dev@lists.osgeo.org mailing list can be used for discussion of development and user issues related to OGR and related technologies. Alternative Bindings for the OGR API

Через SaaPlanet Перед тем как перейдем к пошаговым инструкциям, предлагаю ознакомиться с техническими требованиями и ограничениями по использованию растровых карт и спутниковых снимков. Технические требования Совместимые туристические GPS навигаторы: GARMIN Oregon 450/ Oregon 550/ Dakota 10/ Dakota 20/ Colorado 300/ GPSMAP 62 и GPSMAP 62S/ GPSMAP 78 и GPSMAP 78S Формат данных KMZ файл с привязанными растровыми картами или спутниковыми снимкамиформат карт/снимков - JPEGподдерживается не более 100 изображений (фрагментов/тайлов) с растровыми картами/снимкамиразмер каждого фрагмента не более 3мбизображения размером не более 1 МП (1024x1024 pix, 512x2048 pix) – изображения большего размера будут уменьшаться, что приведет к худшему отображению на экране Для загрузки спутниковых снимков нам потребуется всего одна бесплатная программа – SAS.Планета. Как я уже писал выше, саму программу можно загрузить на сайте разработчика Шаг 1. – Запускаем программу Шаг 3. – Выделяем область загрузки

HTML5 Canvas: An Open Standard for High Performing GIS Map Visualization in Web Browsers Summary: The evolution of GIS on the Web has, until recently, been limited by traditional Web mapping technologies. The increase in GIS requirements in the Web and mobile world has necessitated the development of a new breed of map engine. Introduction: Web GIS - the traditional approach Rendering maps as tiles in raster image format (PNG or JPEG images) is the way geospatial data are commonly delivered on the Web today. This is all good for Web mapping, but what about GIS? Also you may need to interact with the data, which is not possible if your data are presented as flat raster images. Rendering vectors as vectors As we all know, geospatial vector data consist of three basic types: point, lines and polygons. Rendering vectors as vectors can open up a whole new set of possibilities for GIS on the Web and on mobile devices. What if we had a solution which could actually render vector data in their natural vector form? HTML5 Canvas HTML5 Canvas tiled vector map engine

jQuery Geo docs Welcome! jQuery Geo is an open-source, geospatial mapping jQuery plugin from Applied Geographics developed with the intention of making spatial web mapping significantly simpler than it may initially seem. We would like to point out the term "open-source" to explictly state that Google, Bing, & Esri are generally free but not open. Please read the following sections for more information and examples, and thank you for considering us! If you would like only release notifications, you can follow the project itself on Twitter. docs This project takes pride in having easy-to-use, up-to-date documentation. examples Now that that's out of the way, here are some code examples! "everything" examples These first two examples attempt to let you test as many of jQuery Geo's features as possible on one page. demos The examples in this second set of use the features of jQuery Geo in a more interesting way. showcase This third set are more complete examples using jQuery Geo. component examples internals

alextutubalin: О растре в GPS (HOWTO) Кросспост из блога автора. Комментировать лучше там, но можно и тут Данный текст написан для себя, чтобы не забыть и не биться об лед повторно. Возможно, какие-то шаги у меня - избыточные, но у меня работает, а разбираться в бОльших деталях - лень. Задача Задача проста - загнать в GPS-прибор (конкретно - Garmin 62s) растровые карты ("генштаб" с poehali.org) и спутниковые снимки, так чтобы все работало и не тормозило. Ставший уже "классическим" способ описан на Веломании и в моем случае и с моим прибором у него оказалось два существенных недостатка: Слишком сложно (часть шагов - лишняя) Не работает (если быть точным, то работает не всегда и не везде) Путем перебора имеющихся в сети средств, удалось найти подходящий набор деталей и шагов, которые у меня работают стабильно, удобно и быстро. Приборы и материалы Сначала надо запатчить прошивку прибора, чтобы он понимал более одной непривязанной (к прибору) растровой карты. Для конверсии карт и выкачки спутниковых снимков потребуются: Выкачка

Interactive maps with OpenLayers examples Embed a map in your website - Using wizard Use the OpenLayers Wizard to generate your own customized snippet. Copy/paste the generated snippet to your page source (it should look like sample below). <html><head> […] <!-- Road-Maps API //--><script src='//ec.europa.eu/wel/maps/open_layers/scripts/openlayers_eu_min.js'></script><!-- /Road-Maps API //--> […] </head><body> […] <! Embed a map in your website - Manually Required files Include the OpenLayers API in the <HEAD> section of your document: <head> […] <! Required elements Define the container into which the map will appear in the <BODY> section of your document: <! Layers / Placemarks / Data Include placemarks and data using kml files through a JSON object ollayers requiring 3 parameters: identifier / name: key identifying the layer in the JSON object label: Label of the kml file. Important: If you use kml file, make sure it respects the correct structure OPTIONAL: You could define several layers. List of styles for placemarks: Parameters

I tried this with my own image and it worked well, don't know how it works with Google maps, etc. by yalcat Apr 29

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