d********f 发帖数: 43471 | 1 Einstein's Relativity and Everyday Life
By Clifford M. Will
Earth viewed from space
What good is fundamental physics to the person on the street?
This is the perennial question posed to physicists by their non-science
friends, by students in the humanities and social sciences, and by
politicians looking to justify spending tax dollars on basic science. One of
the problems is that it is hard to predict definitely what the payback of
basic physics will be, though few dispute that physics is someho... 阅读全帖 |
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d*********2 发帖数: 48111 | 2 从这个thread就可以看出来现在mitbbs的堕落. 混迹的都不知道是哪个旮旯里的小留,
F2, 和文科生们.
从普物哪里瞅过几眼拉格朗日或者hamilton的就敢来白话了.
牛力最大的贡献就是确定了motion和interaction之间的关系, 在此之前, 人类的认知
里认为力是维持运动的原理, 牛力告诉你, No, 力不是维持运动的原理, 是改变运动的
原因.
至于L^ or H^只不过是数学模式上的两个算子罢了, 就和你把F=ma写成F=d(mv)/dt一样
, 没换药, 连汤都没换, 最多换了个碗.
牛力和牛力基础上建立起来经典力学, 力学分析, 受力平衡, 扭力纽拒分析, 传动分析
等等, 没有这些东西, 哪来的机械基础?
你就是那种读了两本科普就以为瓦特是第一个发现蒸气机的了吧, 看了个开水蒸汽顶锅
盖.
还有牛三, 动量守恒可以看作是牛三的一个推论或者另一种论述, jet, rocket这么多
现代日常科技都是以此作为的基础.
而且上周带娃读的一个幼儿reading, 讲的就是科技对于英国成为海上霸主的贡献, 你
连经纬度都确定不了的, 航个P的海啊. 牛力的出现首先... 阅读全帖 |
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d*********2 发帖数: 48111 | 3 其实最牛逼的地方还不在于他个人热情的投入.
他一个乡村木匠, 没有学历, 20岁的时候拿张图纸跑伦敦就能拿到赞助.
最后50多年总共拿到几千磅sterling的赞助.
最后longitude committee不给发奖金, 人直接就能找到国王面圣去评理.
这个制度体系才是英国能成为科技爆炸源生地的终极理由.
能工巧匠, 中国汉朝的时候就满把抓了. |
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H********g 发帖数: 43926 | 4 31.869 μT (3.2 × 10−5 T) – strength of Earth's magnetic field at 0
° latitude, 0° longitude
.
( |
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L*****E 发帖数: 658 | 5 ip也符合
修改:·nuscx 於 Nov 20 10:17:27 2010 修改本文·[FROM: 24.58.]
IP Information - 24.58.37.92
Host name cpe-24-58-37-92.twcny.res.rr.com
Country United States
Country Code US
Region New York
City Syracuse
Postal Code 13215
Latitude 42.9732
Longitude -76.2259
Area Code 315
DMA Code 555 |
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p*********s 发帖数: 29 | 6 Country: United States
State/Region: Nevada
City: Las Vegas
Latitude: 36.2143
Longitude: -115.2131
Area Code: 702
Postal Code: 89108
Nevada的华人率先解决了这个世界性的剩男剩女难题了? 不信,你就想偷懒而已吧, hehe |
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发帖数: 1 | 7 对山景城教会兄弟姊妹们的一点小建议!
https://7000christian.blogspot.com/2018/08/blog-post_26.html
山景城教会那么多人,而《旧金山共识》已在2008年就发表了,就没有一个有过警惕之
心么?说明整个教会的属灵状态真的让人担心,说明以前的牧师的牧羊能力有限,整整
9年!如果不能认清这伙人的统战本质,以后再上当受骗难免。推荐阅读王长新写的有
关王明道的《又四十年》。
好几年前(2009年?),我在“大陆基徒论坛”引用王英牧师的文章抵挡远志明,刘同
苏等人的《旧金山共识》,有人对王英牧师造谣中伤,我叫他拿出证据却没有。几年后
(2012?)同样的造谣再次在我“七千人教会论坛”出现,这次我查了造谣者的IP地址,
就是来自山景城教会!我当时的推测是刘同苏本人,几年在不同网站两次造同样的谣,
都被我抓包!如果不是他本人,他在你们教会一定有亲密同伙!
建议你们教会的人读一读本博客和王英牧师揭刘同苏的文章,找到真相本质重点!
我爱阿朱阿紫
2018/08/26
我刚才在网上找到了我几前发的贴在猫眼看人的,请参看:
https://club.kd... 阅读全帖 |
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r*****l 发帖数: 216 | 8 看到版上有人问纽约附近有没有校友组织,答案是有!新泽西地区每年都有聚会。今年
的聚会在10月15号,欢迎新人老人参加。请版主置顶,谢谢!
Dear BUPT alumni,
We are excited to invite you to 2011 BUPT alumni picnic on Oct 15 at 2:30pm
in Roosevelt Park, Edison, NJ. Let's reunion with old friends and meet new
BUPTers in this beautiful season. All family members are warmly welcome.
Time: Oct 15 (Saturday) 2:30-6:00 PM
Rain Date: Oct 22 (Saturday) 2:30-6:00 PM (We will email everyone in the
morning of Oct 15 if the event has to be postponed due to weather related
issue... 阅读全帖 |
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r*****l 发帖数: 216 | 9 看到版上有人问纽约附近有没有校友组织,答案是有!新泽西地区每年都有聚会。今年
的聚会在10月15号,欢迎新人老人参加。请版主置顶,谢谢!
Dear BUPT alumni,
We are excited to invite you to 2011 BUPT alumni picnic on Oct 15 at 2:30pm
in Roosevelt Park, Edison, NJ. Let's reunion with old friends and meet new
BUPTers in this beautiful season. All family members are warmly welcome.
Time: Oct 15 (Saturday) 2:30-6:00 PM
Rain Date: Oct 22 (Saturday) 2:30-6:00 PM (We will email everyone in the
morning of Oct 15 if the event has to be postponed due to weather related
issue... 阅读全帖 |
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h***m 发帖数: 1869 | 10 保存文件到本机,
点右键,然后properties, Details
就有各种信息了:
Date taken: 2013/5/10 9:43
Camera maker: Apple
Camera model: iPhone 4S
Latitude: 24; 40; 37.199
Longitude: 118; 42; 12.00
Altitude: 13 |
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i***1 发帖数: 2534 | 11 Test Date: Oct 26, 2011 12:05 PM
Connection Type: Cellular
Server: San Jose, CA
Download: 1.74 Mbps
Upload: 0.78 Mbps
Ping: 59 ms
External IP: 66.87.118.89
Internal IP: 21.223.26.89
Latitude: 37.3073
Longitude: -121.8568 |
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c******n 发帖数: 16666 | 12 来自主题: BuildingWeb版 - 请问在中国 mit现在我上的这个服务器
Hostname www.mitbbs.com ISP Amazon.com, Inc. (AS14618)
Continent North America Flag US
Country United States Country Code US (USA)
Region Virginia Local time 23 Aug 2013 22:53 EDT
Metropolis* Washington DC (Hagerstown) Postal Code
Unknown
City Ashburn Latitude 39.044
IP Address 107.21.18.224 Longitude -77.488
看样子是用... 阅读全帖 |
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s********e 发帖数: 893 | 13 一个Table里有5万个地址,每个地址已经计算了latitude和longitude。
现在需要找出每个地址的50Mile以内的其它地址和相应距离。我打算把这5万个地址的
50mile以内的其他地址都先算好,把ID和距离存在table里面。现在有两种储存方式:
1.
ID DIST_ID Distance
1234 3434 2.3
1234 3456 3.4
1234 6655 12.5
1234 6644 26.5
1234 7788 45.6
如果平均每个地址有20个其他地址在50mile以内,那这个table就有1Million条记录
第二种储存方式是:
2. ID Dist_ID_Mile
1234 3434,2.3, 3456,3.4,6655,12.5,6644,26.5,7788,45.6
这样这个Table也是5万条记录。只是检索时要parse 后面这个长字符串,把ID和
distance另外保存起来。这个工作可以在web application里做。
请问... 阅读全帖 |
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t*****g 发帖数: 1275 | 14 Have you ever considered a non-DB approach?
The data structure looks pretty straightforward. You may find a way (need
some compression) to put all data including a unique key (8 bytes) into a
16GB 64bit machine.
Now think about the reverse index.You need to build index on cabid/timestamp
/longitude/latitude, each index could fit into a single machine.
When queries come in, get sets of unique keys from all indices and find the
intersect.
Do your final query on the datahost to return result.
I wou |
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m*****v 发帖数: 644 | 15 项目要找客户点的10miles以内competior的个数。
我有了客户点的Latitude和longtitude,大概1000多个。还有很多有latitude和
longitude的点,里面有这个block内的competitors的数。我应该怎么算呢?一点思路
都没有。谢谢各位大侠。 |
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w***a 发帖数: 313 | 16 8年以前弄过一个。
要有一个地址坐标数据库。我拿到的是邮编以及对应的经纬度数据库。
步骤是,先把你要找的地址转成经纬度,经纬度可以与距离互相换算,换算出20mile对
应的经纬度分别是多少(不用太精确),再select 邮编 where latitude, longitude
< 20mile对应的经纬度, 然后从dealer数据表里,找出邮编是这些选出的邮编的dealer
,然后再计算复查这些dealer到你要找的地址的精确距离,把20mile以外的去除,剩下
的就可以输出了。
我以前做的,是找一个品牌产品的代销店。按上述算法实现很完美。 |
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B*A 发帖数: 83 | 17 我也弄过一个类似的。监控监外执行犯活动范围的。
当时是买的专业APi 从OracIe里CallOut。
longitude
dealer
★ 发自iPhone App: ChineseWeb - 中文网站浏览器 |
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s********e 发帖数: 893 | 18 一个Table里有5万个地址,每个地址已经计算了latitude和longitude。
现在需要找出每个地址的50Mile以内的其它地址和相应距离。我打算把这5万个地址的
50mile以内的其他地址都先算好,把ID和距离存在table里面。现在有两种储存方式:
1.
ID DIST_ID Distance
1234 3434 2.3
1234 3456 3.4
1234 6655 12.5
1234 6644 26.5
1234 7788 45.6
如果平均每个地址有20个其他地址在50mile以内,那这个table就有1Million条记录
第二种储存方式是:
2. ID Dist_ID_Mile
1234 3434,2.3, 3456,3.4,6655,12.5,6644,26.5,7788,45.6
这样这个Table也是5万条记录。
只是检索时要parse 后面这个长字符串,把ID和distance另外保存起来。这个工作可以
在web application里做。
请问大... 阅读全帖 |
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c*****d 发帖数: 6045 | 19 想省包子,自己写程序
想省力气,我有全美国的zip
是http://www.zip-codes.com/search.asp的数据
数据包括
Zip Code
City
State
Primary County
Area Code
City Type
City Alias Abbr.
City Alias Name
Latitude
Longitude
Time Zone
Elevation
State FIPS
County FIPS
Daylight Savings
Preferred Last Line Key
Classification Code
Multi County Flag
City Alias Code
Primary Record
Mixed Case City
Mixed Case City Alias
State ANSI Code
County ANSI Code
... 阅读全帖 |
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b******d 发帖数: 794 | 20 另外请教一下,怎么获得没有id/name的table, 好像htmlpage只能获得getElementById
啥的,我这个table什么特征都没有,怎么找到他,还是就作为text搜索,可是搜到之后
,后面的结构也不好搜索了
还有table套table的如何准确定位里面的table, 也是没有id/name的,比如这个
http://RSK.imageg.net/image
s/pixel.gif" width="11" height="1" border="0" /> |
SOLON-SOLON SHOP CTR
... 阅读全帖 | |
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e*****t 发帖数: 1005 | 21 no easy way. if the position is fixed, you can use index. Otherwise you have
to iterate through and check one by one.
另外请教一下,怎么获得没有id/name的table, 好像htmlpage只能获得getElementById
啥的,我这个table什么特征都没有,怎么找到他,还是就作为text搜索,可是搜到之后
,后面的结构也不好搜索了
还有table套table的如何准确定位里面的table, 也是没有id/name的,比如这个
http://RSK.imageg.net/image
s/pixel.gif" width="11" height="1" border="0" /> |
... 阅读全帖 |
|
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v*****r 发帖数: 2325 | 23 withou replying on commercial product and system such as yahoo and google.
reverse geocodeing is defined as loop up nearest street address from longitude, latitude
anybody got experience?
thanks |
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m***h 发帖数: 77 | 24 如果是网页的话先看能不能用Google 的api. 另一个方法是利用geo search,需要
latitude and longitude, 需要100个饭馆的latlng,这个不难,还需要用户输入的邮编
的latlng,不知道简单的办法,网上有卖美加zipcodes数据的,50k邮编的latlng, 把数
据放到mongodb,有现成的geo query. 或者直接先全算出来存到数据库里。solr也有类
似功能。 |
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ET 发帖数: 10701 | 25 can't really rely on google map & apple map doing this. They will not give
your the accurate lat/longitude for many reasons.
this is not a question you only have.
you can try, and meet some use cases. If you fail some, you get bad reviews.
|
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w**z 发帖数: 8232 | 26 有longitude, latitude 任何db 都能search. solr 自己也有 spatial search.
in |
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s*r 发帖数: 2757 | 27 i think you can use google map function
you need the latitude and longitude |
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a*****b 发帖数: 2789 | 28 Fellow actuaries, summer is here. We hope you’ll join us for a barbecue and
picnic! Bring your family and friends, please!
We serve fresh farm raised lamb, sea food, NYC Chinatown marinated meat,
fresh fruits, NJ farm fresh vegetable and drift beer (under permit). Food,
games, hiking, and zoo! Raffle prizes include digital camera, all-in-one jet
printers, etc.
Where: Johnson Park, County Road 622 (River Road), Piscataway Township, NJ,
08854 (We reserved entire Grove 4, see detailed direction be... 阅读全帖 |
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n******e 发帖数: 623 | 29 连接里有人说照片有EXIF有拍摄时间,可以查ISS轨道。然后有人查出来了(假设那时
间是UTC)
Latitude 11 degrees, 45 minutes South
Longitude 132 degrees, 15 minutes West
Altitude 351.4 km, ascending
南太平洋中间,是没什么陆地
我本来只是感叹一下APOD也能看美女。。。 |
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G***G 发帖数: 16778 | 30 10 patiens and 10 healthy people
for each one, test their balancing ability from 1 day, 2 day, 3 day,...
100 day.
What kind of testing can be used to analyze the variable: balancing ability? |
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j***h 发帖数: 4412 | 32 再看Northridge, CA(34.277N,-118.544W), For the 1994 Northridge earthquake,
the intensities MMI VI to IX cover the areas of damage. 然而据USGS的Uniform
Hazard Response Spetra, 其IX度区的设计基本地加速度为0.583,高于GB50011-2001
中最高的9度设防的设计基本地加速度0.40g,更是远远高于《GB50011-2008建筑抗震设
计规范局部修订》中地震局某些“专业”人士出于经济考虑,将此次地震灾区的最高设
防烈度比照唐山市设为八度的设计基本地加速度0.20g。
Conterminous 48 States
2003 NEHRP Seismic Design Provisions
Latitude = 34.277
Longitude = -118.544
Spectral Response Accelerations Ss and S1
Ss and S1 = Mapped Spectral Acceleratio |
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P*U 发帖数: 466 | 33 房子离一个手机站547米,基站信息如下
Latitude: 37.3915
Longitude: -121.8452
Structure Type: Tower
Status: Constructed
Date Constructed: 12/30/2005
Ground Elev: 202.8 feet
Height Of Structure: 60.0 feet
Overall Height: 268.7 feet
Structure Address: 935 Piedmont Rd
San Jose, CA |
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w***n 发帖数: 1084 | 34 有一种东西叫做ip track。
IP address [?]: 147.8.1.1 [Whois] [Reverse IP]
IP country code: HK
IP address country: ip address flag Hong Kong
IP address state: n/a
IP address city: Central District
IP address latitude: 22.2833
IP address longitude: 114.1500
ISP of this IP [?]: The University of Hong Kong
Organization: The University of Hong Kong
90% |
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g*****e 发帖数: 87 | 35 In the GSM system, the location is roughly calculated based on the Timing
advance: Drawing a circle with each neighboring BTS as center with radius
based on TA. The intersection of three circles are more or less of the
location of the MS as each BTS longitude and latitude are known.
UMTS is based on the propagation delay, roughly the same as GSM with more
accuracy. I remember it has something to do short symbol times.
Usually the law enforcement has access to the location system and can
retrieve... 阅读全帖 |
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P*U 发帖数: 466 | 36 房子离一个手机站547米,基站信息如下
Latitude: 37.3915
Longitude: -121.8452
Structure Type: Tower
Status: Constructed
Date Constructed: 12/30/2005
Ground Elev: 202.8 feet
Height Of Structure: 60.0 feet
Overall Height: 268.7 feet
Structure Address: 935 Piedmont Rd
San Jose, CA
基站在一颗大树旁,基站功率为75W,请大家帮忙用公式算算离基站500米的地方安全吗?
谢谢 |
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P*U 发帖数: 466 | 37 房子离一个手机站547米,基站信息如下
Latitude: 37.3915
Longitude: -121.8452
Structure Type: Tower
Status: Constructed
Date Constructed: 12/30/2005
Ground Elev: 202.8 feet
Height Of Structure: 60.0 feet
Overall Height: 268.7 feet
Structure Address: 935 Piedmont Rd
San Jose, CA
基站在一颗大树旁,基站功率为75W,请大家帮忙用公式算算离基站500米的地方安全吗?
谢谢 |
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W*******e 发帖数: 817 | 38 本人是环境地理的门外汉,需要处理EPA 的数据,需要定位facility 的census tract
。每个facility目前有latitude, longitude, ZIP code, county & state FIPS。目前
要找facility数目是250,000+,请教各位高手如何快速有效率地locate 它们的census
tract?还需要其他什么geographical information?包子感谢! |
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W*******e 发帖数: 817 | 39 本人是环境地理的门外汉,需要处理EPA 的数据,需要定位facility 的census tract
。每个facility目前有latitude, longitude, ZIP code, county & state FIPS。目前
要找facility数目是250,000+,请教各位高手如何快速有效率地locate 它们的census
tract?还需要其他什么geographical information?包子感谢! |
|
W*******e 发帖数: 817 | 40 本人是环境地理的门外汉,需要处理EPA 的数据,需要定位facility 的census tract
。每个facility目前有latitude, longitude, ZIP code, county & state FIPS。目前
要找facility数目是250,000+,请教各位高手如何快速有效率地locate 它们的census
tract?还需要其他什么geographical information?包子感谢! |
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p********t 发帖数: 1219 | 41 实在懒得码文,转贴一个wiki。
Geocoding is the process of assigning geographic coordinates (e.g. latitude-
longitude) to street addresses, as well as other points and features. With
geographic coordinates, the features can then be mapped and entered into
Geographic Information Systems.
Address interpolation
For the United States and many other countries, an address interpolation
method is commonly used. This method makes use of street GIS data, where the
street network is already mapped within the geographic |
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p********t 发帖数: 1219 | 42 如果你在一家从事GIS开发的软件公司呆上一阵子,一定经常听到人们提起"地
理编码"这个词。那么,什么是地理编码呢?
我们先来看一看维基百科中是怎么解释的:
Geocoding is the process of assigning geographic coordinates (e.g.
latitude-longitude) to street addresses, as well as other points and
features. With geographic coordinates, the features can then be mapped a
nd
entered into Geographic Information Systems.
——From Wikipedia, the free encyclopedia.
地理编码是将地理坐标(例如经纬度)赋予街道地址还有其他点位和地理特征
的过程。有了地理坐标,地理特征就可以被显示到地图上或运用到地理信息系统中
。
相反的 |
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a*********n 发帖数: 1331 | 43 census data作了projection (projected coordinate system)之后,这是metadata的
信息,有问题吗?我是project to projected coordinate system,可是为什么"
extent" 或"bounding coordinates"却是geographic coordinate system? 而且我
create centroids也还是经度纬度的数。可是我需要projected coordinate system
Horizontal coordinate system
Projected coordinate system name: NAD_1983_StatePlane_New_Jersey_FIPS_2900_
Feet
Geographic coordinate system name: GCS_North_American_1983
Details
Map Projection Name: Transverse Mercator
Scale Factor at Central Meridian... 阅读全帖 |
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W*******e 发帖数: 817 | 44 本人是环境地理的门外汉,需要处理EPA 的数据,需要定位facility 的census tract
。每个facility目前有latitude, longitude, ZIP code, county & state FIPS。目前
要找facility数目是250,000+,请教各位高手如何快速有效率地locate 它们的census
tract?还需要其他什么geographical information?包子感谢! |
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s*****e 发帖数: 422 | 45 I have a huge text file of points (1 million) with latitudes and longitudes.
Is there a fast way to identify the points inside the U.S. and keep them?
Thanks. |
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s*****e 发帖数: 422 | 46 I have a huge text file of points (1 million) with latitudes and longitudes.
Is there a fast way to identify the points inside the U.S. and keep them?
Thanks. |
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