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1. Pengertian Survey dan Pengukuran
Survey atau surveying didefinisikan sebagai pengumpulan data yang berhubungan dengan
1. Pengertian Survey dan Pengukuran
Survey atau surveying didefinisikan sebagai pengumpulan data yang berhubungan dengan pengukuran permukaan bumi dan digambarkan melalui peta atau digital. Sedangkan pengukuran didefinisakan peralatan dan metode yang berhubungan dengan kelangsungan survey tersebut. jadi, surveying adalah segala sesuatu yang berhubungan dengan pengumpulan data. Mulai dari pengukuran permukaan bumi hingga penggambaran bentuk bumi. Sedangkan pengukuran adalah segala sesuatu yang berhubungan dengan penggunaan alat mulai dari pita ukur hingga pengukuran jarak dengan metode elektro magnetik.
Survey umumnya dilakukan pada bidang datar, yaitu dengan tidak memperhitungkan kelengkungan bumi. Dalam proyek surveying, kelengkungan buminya kecil, jadi pengaruhnya dapat diabaikan, dengan menggunakan perhitungan yang rumusnya disederhanakan. Sedangkan pada proyek yang memiliki jarak jauh, kelengkungan bumi tidak dapat diabaikan, karena keadaan ini termasuk surveying geodesi.
CARA MEMASANG CCTV
Langkah-Langkah Cara Memasang kamera cctv
Berikut adalah tips dasar langkah-langkah cara untuk memasang
Langkah-Langkah Cara Memasang kamera cctv
Berikut adalah tips dasar langkah-langkah cara untuk memasang kamera CCTV (Closed Circuit TeleVision):
1. Tentukan kabel yang sesuai
Untuk kabel CCTV, Anda juga dapat dengan menggunakan kabel RG59 Siamese yang telah terdiri dari kabel video dan kabel power (positif dan negatif). Kabel RG59 Siamese juga merupakan kabel standard yang sering digunakan untuk instalasi CCTV.
2. Tentukan lokasi dan area pantauan CCTV
Lokasi pemasangan CCTV juga bisa Anda tentukan berdasarkan jarak pandang yang hendak dimonitoring (apakah dekat atau jauh) dan apakah untuk dalam keadaan gelap atau terang. Dari situ baru Anda bisa tentukan titik pemasangan kamera CCTV.
3. Prioritaskan penempatan kamera CCTV di bawah atap/ tempat terlindung
Terutama untuk pemasangan CCTV di rumah, prioritaskan letak posisi kamera CCTV dibawah atap karena bisa melindungi kamera CCTV Anda dari hujan, angin, dan sebagainya. Selain itu, penempatan di bawah atap juga biasanya telah memberikan tampilan view yang lebih baik dan mudah untuk menarik kabel jaringan.
4. Cari titik untuk mulai menarik kabel dari luar ke dalam
Setelah menentukan titik pemasangan CCTV, berikutnya adalah mencari titik masuk untuk dapat menarik kabel RG56 dari luar ke dalam.
5. Penempatan monitor dan DVR
Monitor dan DVR adalah alat-alat yang telah melengkapi sistem CCTV Anda. Jika kamera CCTV biasanya ditempatkan diluar, maka DVR dan monitor digunakan untuk dapat membantu pemantauan dari dalam ruangan. Tentukan tempat dimana monitor dan DVR akan diletakkan.
6. Memulai penarikan kabel
Setelah didapatkan titik kamera CCTV dan lokasi penempatan monitor dan DVR, maka berikutnya adalah menarik kabel RG59 yang telah menghubungkan antara CCTV dengan monitor dan DVR.
Editor : Dian Sukmawati
Baltimore Residents Away From Turmoil Consider Their Role
BALTIMORE — In the afternoons, the streets of Locust Point are clean and nearly silent. In front of the rowhouses, potted plants rest next to steps of brick or concrete. There is a shopping center nearby with restaurants, and a grocery store filled with fresh foods.
And the National Guard and the police are largely absent. So, too, residents say, are worries about what happened a few miles away on April 27 when, in a space of hours, parts of this city became riot zones.
“They’re not our reality,” Ashley Fowler, 30, said on Monday at the restaurant where she works. “They’re not what we’re living right now. We live in, not to be racist, white America.”
As Baltimore considers its way forward after the violent unrest brought by the death of Freddie Gray, a 25-year-old black man who died of injuries he suffered while in police custody, residents in its predominantly white neighborhoods acknowledge that they are sometimes struggling to understand what beyond Mr. Gray’s death spurred the turmoil here. For many, the poverty and troubled schools of gritty West Baltimore are distant troubles, glimpsed only when they pass through the area on their way somewhere else.
And so neighborhoods of Baltimore are facing altogether different reckonings after Mr. Gray’s death. In mostly black communities like Sandtown-Winchester, where some of the most destructive rioting played out last week, residents are hoping businesses will reopen and that the police will change their strategies. But in mostly white areas like Canton and Locust Point, some residents wonder what role, if any, they should play in reimagining stretches of Baltimore where they do not live.
“Most of the people are kind of at a loss as to what they’re supposed to do,” said Dr. Richard Lamb, a dentist who has practiced in the same Locust Point office for nearly 39 years. “I listen to the news reports. I listen to the clergymen. I listen to the facts of the rampant unemployment and the lack of opportunities in the area. Listen, I pay my taxes. Exactly what can I do?”
And in Canton, where the restaurants have clever names like Nacho Mama’s and Holy Crepe Bakery and Café, Sara Bahr said solutions seemed out of reach for a proudly liberal city.
“I can only imagine how frustrated they must be,” said Ms. Bahr, 36, a nurse who was out with her 3-year-old daughter, Sally. “I just wish I knew how to solve poverty. I don’t know what to do to make it better.”
The day of unrest and the overwhelmingly peaceful demonstrations that followed led to hundreds of arrests, often for violations of the curfew imposed on the city for five consecutive nights while National Guard soldiers patrolled the streets. Although there were isolated instances of trouble in Canton, the neighborhood association said on its website, many parts of southeast Baltimore were physically untouched by the tumult.
Tensions in the city bubbled anew on Monday after reports that the police had wounded a black man in Northwest Baltimore. The authorities denied those reports and sent officers to talk with the crowds that gathered while other officers clutching shields blocked traffic at Pennsylvania and West North Avenues.
Lt. Col. Melvin Russell, a community police officer, said officers had stopped a man suspected of carrying a handgun and that “one of those rounds was spent.”
Colonel Russell said officers had not opened fire, “so we couldn’t have shot him.”
The colonel said the man had not been injured but was taken to a hospital as a precaution. Nearby, many people stood in disbelief, despite the efforts by the authorities to quash reports they described as “unfounded.”
Monday’s episode was a brief moment in a larger drama that has yielded anger and confusion. Although many people said they were familiar with accounts of the police harassing or intimidating residents, many in Canton and Locust Point said they had never experienced it themselves. When they watched the unrest, which many protesters said was fueled by feelings that they lived only on Baltimore’s margins, even those like Ms. Bahr who were pained by what they saw said they could scarcely comprehend the emotions associated with it.
But others, like Lambi Vasilakopoulos, who runs a casual restaurant in Canton, said they were incensed by what unfolded last week.
“What happened wasn’t called for. Protests are one thing; looting is another thing,” he said, adding, “We’re very frustrated because we’re the ones who are going to pay for this.”
There were pockets of optimism, though, that Baltimore would enter a period of reconciliation.
“I’m just hoping for peace,” Natalie Boies, 53, said in front of the Locust Point home where she has lived for 50 years. “Learn to love each other; be patient with each other; find justice; and care.”
A skeptical Mr. Vasilakopoulos predicted tensions would worsen.
“It cannot be fixed,” he said. “It’s going to get worse. Why? Because people don’t obey the laws. They don’t want to obey them.”
But there were few fears that the violence that plagued West Baltimore last week would play out on these relaxed streets. The authorities, Ms. Fowler said, would make sure of that.
“They kept us safe here,” she said. “I didn’t feel uncomfortable when I was in my house three blocks away from here. I knew I was going to be O.K. because I knew they weren’t going to let anyone come and loot our properties or our businesses or burn our cars.”
Ghostly Voices From Thomas Edisonís Dolls Can Now Be Heard
Though Robin and Joan Rolfs owned two rare talking dolls manufactured by Thomas Edison’s phonograph company in 1890, they did not dare play the wax cylinder records tucked inside each one.
The Rolfses, longtime collectors of Edison phonographs, knew that if they turned the cranks on the dolls’ backs, the steel phonograph needle might damage or destroy the grooves of the hollow, ring-shaped cylinder. And so for years, the dolls sat side by side inside a display cabinet, bearers of a message from the dawn of sound recording that nobody could hear.
In 1890, Edison’s dolls were a flop; production lasted only six weeks. Children found them difficult to operate and more scary than cuddly. The recordings inside, which featured snippets of nursery rhymes, wore out quickly.
Yet sound historians say the cylinders were the first entertainment records ever made, and the young girls hired to recite the rhymes were the world’s first recording artists.
Year after year, the Rolfses asked experts if there might be a safe way to play the recordings. Then a government laboratory developed a method to play fragile records without touching them.
The technique relies on a microscope to create images of the grooves in exquisite detail. A computer approximates — with great accuracy — the sounds that would have been created by a needle moving through those grooves.
In 2014, the technology was made available for the first time outside the laboratory.
“The fear all along is that we don’t want to damage these records. We don’t want to put a stylus on them,” said Jerry Fabris, the curator of the Thomas Edison Historical Park in West Orange, N.J. “Now we have the technology to play them safely.”
Last month, the Historical Park posted online three never-before-heard Edison doll recordings, including the two from the Rolfses’ collection. “There are probably more out there, and we’re hoping people will now get them digitized,” Mr. Fabris said.
The technology, which is known as Irene (Image, Reconstruct, Erase Noise, Etc.), was developed by the particle physicist Carl Haber and the engineer Earl Cornell at Lawrence Berkeley. Irene extracts sound from cylinder and disk records. It can also reconstruct audio from recordings so badly damaged they were deemed unplayable.
“We are now hearing sounds from history that I did not expect to hear in my lifetime,” Mr. Fabris said.
The Rolfses said they were not sure what to expect in August when they carefully packed their two Edison doll cylinders, still attached to their motors, and drove from their home in Hortonville, Wis., to the National Document Conservation Center in Andover, Mass. The center had recently acquired Irene technology.
Cylinders carry sound in a spiral groove cut by a phonograph recording needle that vibrates up and down, creating a surface made of tiny hills and valleys. In the Irene set-up, a microscope perched above the shaft takes thousands of high-resolution images of small sections of the grooves.
Stitched together, the images provide a topographic map of the cylinder’s surface, charting changes in depth as small as one five-hundredth the thickness of a human hair. Pitch, volume and timbre are all encoded in the hills and valleys and the speed at which the record is played.
At the conservation center, the preservation specialist Mason Vander Lugt attached one of the cylinders to the end of a rotating shaft. Huddled around a computer screen, the Rolfses first saw the wiggly waveform generated by Irene. Then came the digital audio. The words were at first indistinct, but as Mr. Lugt filtered out more of the noise, the rhyme became clearer.
Recently, the conservation center turned up another surprise.
In 2010, the Woody Guthrie Foundation received 18 oversize phonograph disks from an anonymous donor. No one knew if any of the dirt-stained recordings featured Guthrie, but Tiffany Colannino, then the foundation’s archivist, had stored them unplayed until she heard about Irene.
Last fall, the center extracted audio from one of the records, labeled “Jam Session 9” and emailed the digital file to Ms. Colannino.
“I was just sitting in my dining room, and the next thing I know, I’m hearing Woody,” she said. In between solo performances of “Ladies Auxiliary,” “Jesus Christ,” and “Dead or Alive,” Guthrie tells jokes, offers some back story, and makes the audience laugh. “It is quintessential Guthrie,” Ms. Colannino said.
The Rolfses’ dolls are back in the display cabinet in Wisconsin. But with audio stored on several computers, they now have a permanent voice.