标签: maps

为了计算纬度/经度所代表的最近位置,我正在考虑将地图划分为小网格,大约100x100米网格.基本上每个点都将分配给一个网格.

据我所知,我也可以使用MySQL等空间索引,但我计划使用像Cassandra这样的非关系型数据库,因为很难对空间对象进行索引,因此某种网格近似技术可能很简洁.

创建这样一个网格系统并将二维空间位置映射到它的最佳方法是什么？

编辑1:如果网格不完全均匀,那么可能没什么问题.

我有一个非常大的CSv文件,我想在谷歌地图或只是在地图上.这些只是坐标,但我有600.000 ..

你知道怎么做吗？

我在下面的XTabulator中添加了一个截图:

因此,我的openlayers实现的背景似乎被压缩成垂直条纹.奇怪的是它并不总是这样,但即使我把所有的变化都藏回到我知道它正在工作的地方,它仍然被打破了.这让我想知道是否有些东西已经改变了瓷砖资产的交付方式.我已经尝试在使用osm和wms图层之间切换而没有任何改变,任何帮助将不胜感激.

这是相关的代码:

initMap: function() {
  var view = this;
  var map = this.map = new OpenLayers.Map();
  map.render(this.$map[0]);

  var wmsLayer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
    "http://vmap0.tiles.osgeo.org/wms/vmap0?", {layers: 'basic'});

  var osmLayer = new OpenLayers.Layer.OSM();

  this.layers = {
    point: new OpenLayers.Layer.Vector("Point Layer"),
    line: new OpenLayers.Layer.Vector("Line Layer"),
    polygon: new OpenLayers.Layer.Vector("Polygon Layer")
  };

  this.setValue(this.value);

  map.addLayers([this.layers.point, this.layers.line, this.layers.polygon, osmLayer]);

  drawControls = {
    point: new OpenLayers.Control.DrawFeature(this.layers.point,
      OpenLayers.Handler.Point),
    line: new OpenLayers.Control.DrawFeature(this.layers.line,
      OpenLayers.Handler.Path),
    polygon: new OpenLayers.Control.DrawFeature(this.layers.polygon,
      OpenLayers.Handler.Polygon)
  };

  this.layers[this.layerType].events.on({'sketchcomplete': function(feature) {

    if (!view.multiple) {
      // deactivate polygon layer once …

我目前正在研究一个学校项目,我正在尝试学习将OSM地图图块下载到手机的本地内存/缓存中的技术,以便用户能够在离线时查看地图.

这是通过给出特定位置来完成的,并且在距离该位置的特定半径/距离内的地图图块将被下载到手机存储器中(当存在在线连接时)以用于离线显示.

但是,我在理解OSMDroid的API方面遇到了一些麻烦.根据我的理解,所涉及的课程似乎是:

• MapTileBase
• MapDownloader
• IFilesystemCache

如果我弄错了,请纠正我.

另外,在MapTileBase(我认为是提供者)中,getMapTile返回android.graphics.drawable.Drawable.

这个Drawable类甚至与离线地图显示的概念有关吗？

希望有人可以告诉我在哪里准确地将地图下载到手机的内存中,以及我们如何编辑地图以显示路线,引脚等界面项目.

在看了Google Devs 的最新视频后,我决定制作一张英国的区域地图.在这个网站上提到的一些可能性,我已经不得不解雇*

所以我最终使用这个网站(数据下载的示例页面):http://mapit.mysociety.org/area/11804.html

注意GeoJSON下载作为第三个链接下来？它的文件大小约为1Mb.当我第一次尝试将它与我的地图一起使用时:

function initMap(){
    var ukc = new google.maps.LatLng(54.8, -4.6);
    var mapOptions = {
        zoom: 5,
        center: ukc
    };
    map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
    map.data.loadGeoJson('http://local.mapsite.com:8080/app/jsondata/eastern.json');
}

$(document).ready(function(){
    initMap();
});

我收到了上述错误:Uncaught InvalidValueError:不是Feature或FeatureCollection

修复尝试1 - 谷歌它

谷歌搜索错误回来没有任何用处.

修复尝试2 - 收缩它

我想也许这是野兽的庞大规模所以我使用mapshaper.org将它缩小到一个更易于管理的10K.仍然没有运气!

修复尝试3 - Lint it

也许我的GeoJSON格式错误了？但是怎么可能会考虑在mapit.org上工作,但是我找到了这个用于绘制GeoJSON数据的精彩网站:http://geojsonlint.com/ - linting有效!显然,GeoJSON工作得非常好,它在英国的所有荣耀中绘制了我的东英吉利亚多边形(注意geojsonlint使用OpenStreetMap).但仍然没有运气

修复尝试4 - TopoJson

希望我可以结合区域并压缩,同时我绝望地认为topojson会起作用.我试过 - 我仍然有同样的错误.这是我在Google云端硬盘上分享的topojson文件的链接:someregions.json 没有运气.

修复尝试5 - 添加功能代码以启动JSON

当前的GeoJSON文件启动{"bbox":[ - 0.745702,51.448473,1.767999,52.98991],"type":"GeometryCollection","geometry":...

我补充说:

{"type": "Feature", "bbox":[-0.745702,51.448473,1.767999,52.98991],"type":"GeometryCollection","geometries": …

进一步潜入kivy,我开始想知道有哪些地图选项(谷歌地图或类似开放的街道地图).到目前为止我发现了什么:

KivyMaps 链接到目前为止我找到的最有用的模块.它应该适用于mac,windows,android和iOS(实验),但是:我没有在任何地方找到文档!我google了很多,仍然不知道如何使用kivyMaps

Kivy Mapview 链接可用槽式花园.好的文档,但他们说它只适用于android.对我来说,它确实可以在Kivy + Mac上运行,至少可以显示和移动地图.设置坐标并更改它们不会.

所以我想我的问题是:你用什么？我错过了其他可用选项吗？KivyMaps文档在哪里(有人可以提供示例吗？)

我在标题中包含了两个以下脚本,我收到错误"您已在此页面上多次包含Google Maps API.这可能会导致意外错误."

<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js key=************"></script>

<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?libraries=places&sensor=false"></script>

当我删除任何一个脚本时,我会得到额外的js错误.如何在我的rails应用程序中正确地重构这两个脚本？

我在未定形的多边形地图的中心画圆圈.圆圈位于该国大部分地区的中心.但对于"挪威"多边形的形状,返回中心点是错误的.缩放/缩放页面后,您可以清楚地看到差异.

我使用了这个stackoverflow解决方案:链接

我的代码在这里.SVG:

<svg xmlns="http://www.w3.org/2000/svg" style="overflow: hidden; z-index: 0; float: left; background: transparent; height: 500px; width: 500px; margin-top: 0px; margin-left: 0px;">
 <path class="mapShape" stroke="#FFFFFF" stroke-width="0.25" fill="#ffff00" d="M289.61881571694846,107.44341140465033,293.96308112495205,110.5369251340838,292.1742152937817,111.64028258514635,293.69594267913214,114.17588213225122,291.33275072129567,115.75640079550517,290.21101327644885,116.115304587361,290.79940687634996,113.34302402649551,289.01707237203874,111.73064813415773,286.86058614336986,113.10652807111005,286.17946205663384,116.00897875925767,284.8551099335093,117.71420145300249,283.3639577705983,116.78716653168755,281.5503303156214,116.97787478097227,280.0068557650149,114.91879878457861,279.17443456817995,115.95395481299134,278.3128736053582,116.11389849530838,278.1091105619184,118.63382135713674,275.4914839478672,118.02707970555407,275.1238635503685,120.11785014900434,273.7901091874799,120.10529402219055,272.87321137841224,122.7050543288587,271.48390485080984,126.60600357598904,269.3273468493182,131.3173178164711,269.8332017031975,132.42411528484843,269.3498835156233,133.6909765856373,267.9721324124638,133.63667113556374,267.07023512332535,136.56637255563933,267.1556447822521,140.55669253761528,268.04325927968785,142.03410132622142,267.5838414420485,145.3716436133896,266.42815545209885,147.26315676671453,265.8157897294402,148.82368555076928,264.88410671891126,147.16092140518467,262.1416671663106,150.27022727262624,260.28992834251846,150.88797751378152,258.3692158361812,149.54060413568916,257.8725479035983,146.63056295282385,257.4334417747625,140.05376745248705,258.71236170116373,138.13152704055724,262.3797376189663,135.55992732652805,265.12181830745385,132.29324106111955,267.6643705490366,127.68026976914571,271.0015914827522,120.85619046583638,273.32767689129025,118.04298816880565,277.1444838258035,113.13815447740048,280.19224496586196,111.35745222872376,282.47741986550216,111.5754647031133,284.5924214026924,108.10819671605745,287.12506899475255,108.29698566394183ZM284.83905555555555,72.19815552139636,281.7365555555555,74.85366572152822,279.28612499999997,73.35699077101634,280.24459722222224,71.66044868206447,279.40541666666667,69.508641420061,282.28369444444445,68.1303212868272,282.8351944444444,70.69457195193213ZM275.84976388888896,58.9806663889022,280.42198611111115,64.57567572395904,276.92690277777774,67.37974197318883,276.1551666666667,72.37724133868834,274.9366805555556,73.61091608778322,274.2752777777778,78.81637965917018,272.6015972222222,79.05316716888755,269.61470833333334,75.26524507138704,270.87438888888886,72.97467771855085,268.79249999999996,71.06094914643477,266.0865416666667,65.20265086315597,265.0062916666667,59.363240232610856,268.7927361111111,56.545993503156645,269.5535,59.301357483657114,271.5316944444445,59.193568518861454,272.0590972222222,56.500983977896404,274.0984027777777,56.221878380253195ZM285.84392411084985,53.30414066139549,288.5659801818243,56.17728511117262,286.50645903652526,60.397046089088526,282.4784246850189,61.291565425339506,278.3822061520165,60.0221846103223,278.1350923237096,57.880800099653854,276.14203281216373,57.74271786397911,274.62224329302427,54.037937230381914,278.9111000819593,51.69790103414376,280.92770107932694,53.71698527072119,282.3322952181492,51.194805998985345Z" stroke-linejoin="round" stroke-linecap="square" nodeValue="#E0E0E0"></path>
<circle fill="#FE0000" cx="271.7692623673869" cy="128.99711033923683" fill-opacity="1" r="1"></circle>
</svg>

JavaScript的:

var path = "289.61881571694846,107.44341140465033,293.96308112495205,110.5369251340838,292.1742152937817,111.64028258514635,293.69594267913214,114.17588213225122,291.33275072129566,115.75640079550517,290.21101327644885,116.115304587361,290.79940687634996,113.34302402649551,289.01707237203874,111.73064813415773,286.86058614336985,113.10652807111005,286.17946205663383,116.00897875925767,284.8551099335093,117.71420145300249,283.3639577705983,116.78716653168754,281.5503303156214,116.97787478097227,280.0068557650149,114.91879878457861,279.17443456817994,115.95395481299134,278.3128736053582,116.11389849530837,278.1091105619184,118.63382135713674,275.4914839478672,118.02707970555407,275.1238635503685,120.11785014900434,273.7901091874799,120.10529402219055,272.87321137841223,122.7050543288587,271.48390485080983,126.60600357598903,269.3273468493182,131.3173178164711,269.8332017031975,132.42411528484843,269.3498835156233,133.6909765856373,267.9721324124638,133.63667113556374,267.07023512332534,136.56637255563933,267.1556447822521,140.55669253761528,268.04325927968784,142.03410132622142,267.5838414420485,145.3716436133896,266.42815545209885,147.26315676671453,265.8157897294402,148.82368555076928,264.88410671891125,147.16092140518467,262.1416671663106,150.27022727262624,260.28992834251846,150.88797751378152,258.3692158361812,149.54060413568916,257.8725479035983,146.63056295282385,257.4334417747625,140.05376745248705,258.71236170116373,138.13152704055724,262.3797376189663,135.55992732652805,265.12181830745385,132.29324106111954,267.6643705490366,127.68026976914571,271.0015914827522,120.85619046583638,273.32767689129025,118.04298816880565,277.1444838258035,113.13815447740047,280.19224496586196,111.35745222872376,282.47741986550215,111.5754647031133,284.5924214026924,108.10819671605745,287.12506899475255,108.29698566394182"
        var stringData = path.split(",");
        var length = stringData.length;
        var data = [], obj;

        for (var i = 0; i < length; i = i + 2) {
            obj = { x: parseFloat(stringData[i]), y: parseFloat(stringData[i + 1]) }; …

我有一个Google MAPS API KEY,当您使用逆向工程反编译我的应用程序时,可以很容易地看到它.这根本不好.另外,我在源代码中使用Weather API KEY通过字符串访问.

我找到了这个网站https://medium.com/@cassioso/a-strategy-to-secure-your-api-keys-using-gradle-b9c107272860

并且想问你,如果推荐这篇文章或者你有更好的想法吗？

有没有人对这个问题有任何经验？

我正在使用ProGuard,但ProGuard并不会混淆AndroidManifest(就我所读甚至是不可能)而且它也不会混淆任何StringAPI KEY(我不知道为什么)

我对DexGuard没有任何经验.

您能告诉我这个网站是否正常工作,或者您能否提供一些如何在清单和源代码中隐藏api密钥的技巧.

我有一个使用Angular Google Maps来显示位置的应用程序.一开始我能够显示地图,但是一段时间(可能是我修改了一些东西)我收到以下错误:

ERROR Error: Uncaught (in promise): Error: StaticInjectorError[NgZone]: 
StaticInjectorError[NgZone]: 
NullInjectorError: No provider for NgZone!
at _NullInjector.get (core.js:923)
at resolveToken (core.js:1211)
at tryResolveToken (core.js:1153)
at StaticInjector.get (core.js:1024)
at resolveToken (core.js:1211)
at tryResolveToken (core.js:1153)
at StaticInjector.get (core.js:1024)
at resolveNgModuleDep (core.js:10585)
at NgModuleRef_.get (core.js:11806)
at resolveDep (core.js:12302)
at _NullInjector.get (core.js:923)
at resolveToken (core.js:1211)
at tryResolveToken (core.js:1153)
at StaticInjector.get (core.js:1024)
at resolveToken (core.js:1211)
at tryResolveToken (core.js:1153)
at StaticInjector.get (core.js:1024)
at resolveNgModuleDep (core.js:10585)
at NgModuleRef_.get (core.js:11806)
at resolveDep (core.js:12302)
at resolvePromise (zone.js:824)
at …